diff --git a/docs/how-to-guides/widgets/legacy-widget-block.md b/docs/how-to-guides/widgets/legacy-widget-block.md
index c32136a10e4fef..21d22561d1509c 100644
--- a/docs/how-to-guides/widgets/legacy-widget-block.md
+++ b/docs/how-to-guides/widgets/legacy-widget-block.md
@@ -123,3 +123,49 @@ function hide_example_widget( $widget_types ) {
 }
 add_filter( 'widget_types_to_hide_from_legacy_widget_block', 'hide_example_widget' );
 ```
+
+## Using the Legacy Widget block in other block editors (Advanced)
+
+You may optionally allow the Legacy Widget block in other block editors such as
+the WordPress post editor. This is not enabled by default.
+
+First, ensure that any styles and scripts required by the legacy widgets are
+loaded onto the page. A convenient way of doing this is to manually perform all
+of the hooks that ordinarily run when a user browses to the widgets WP Admin
+screen.
+
+```php
+add_action( 'admin_print_styles', function() {
+	if ( get_current_screen()->is_block_editor() ) {
+		do_action( 'admin_print_styles-widgets.php' );
+	}
+} );
+add_action( 'admin_print_scripts', function() {
+	if ( get_current_screen()->is_block_editor() ) {
+		do_action( 'load-widgets.php' );
+		do_action( 'widgets.php' );
+		do_action( 'sidebar_admin_setup' );
+		do_action( 'admin_print_scripts-widgets.php' );
+	}
+} );
+add_action( 'admin_print_footer_scripts', function() {
+	if ( get_current_screen()->is_block_editor() ) {
+		do_action( 'admin_print_footer_scripts-widgets.php' );
+	}
+} );
+add_action( 'admin_footer', function() {
+	if ( get_current_screen()->is_block_editor() ) {
+		do_action( 'admin_footer-widgets.php' );
+	}
+} );
+```
+
+Then, register the Legacy Widget block using `registerLegacyWidgetBlock` which
+is defined in the `@wordpress/widgets` package.
+
+```php
+add_action( 'enqueue_block_editor_assets', function() {
+	wp_enqueue_script( 'wp-widgets' );
+	wp_add_inline_script( 'wp-widgets', 'wp.widgets.registerLegacyWidgetBlock()' );
+} );
+```
diff --git a/lib/blocks.php b/lib/blocks.php
index 8f838b24fff7fb..e6e2968a23fd4d 100644
--- a/lib/blocks.php
+++ b/lib/blocks.php
@@ -5,24 +5,6 @@
  * @package gutenberg
  */
 
-/*
- * Fixes the priority of register_block_core_legacy_widget().
- *
- * This hook was incorrectly added to Core with priority 20. #32300 fixes this
- * but causes block registration warnings in the Gutenberg plugin until the
- * changes are made in Core.
- *
- * This temporary fix can be removed after the changes to
- * @wordpress/block-library in #32300 have been published to npm and updated in
- * Core.
- *
- * See https://github.com/WordPress/gutenberg/pull/32300.
- */
-if ( 20 === has_action( 'init', 'register_block_core_legacy_widget' ) ) {
-	remove_action( 'init', 'register_block_core_legacy_widget', 20 );
-	add_action( 'init', 'register_block_core_legacy_widget', 10 );
-}
-
 /**
  * Substitutes the implementation of a core-registered block type, if exists,
  * with the built result from the plugin.
@@ -74,7 +56,6 @@ function gutenberg_reregister_core_block_types() {
 				'file.php'                      => 'core/file',
 				'latest-comments.php'           => 'core/latest-comments',
 				'latest-posts.php'              => 'core/latest-posts',
-				'legacy-widget.php'             => 'core/legacy-widget',
 				'loginout.php'                  => 'core/loginout',
 				'navigation.php'                => 'core/navigation',
 				'navigation-link.php'           => 'core/navigation-link',
@@ -120,8 +101,14 @@ function gutenberg_reregister_core_block_types() {
 			'block_folders' => array(
 				'widget-area',
 			),
+			'block_names'   => array(),
+		),
+		__DIR__ . '/../build/widgets/blocks/'       => array(
+			'block_folders' => array(
+				'legacy-widget',
+			),
 			'block_names'   => array(
-				'widget-area.php' => 'core/widget-area',
+				'legacy-widget.php' => 'core/legacy-widget',
 			),
 		),
 	);
diff --git a/lib/class-wp-theme-json-gutenberg.php b/lib/class-wp-theme-json-gutenberg.php
index 16c41bb15b160a..236afa3ef15999 100644
--- a/lib/class-wp-theme-json-gutenberg.php
+++ b/lib/class-wp-theme-json-gutenberg.php
@@ -34,6 +34,12 @@ class WP_Theme_JSON_Gutenberg {
 	 */
 	const ROOT_BLOCK_SELECTOR = 'body';
 
+	const VALID_ORIGINS = array(
+		'core',
+		'theme',
+		'user',
+	);
+
 	const VALID_TOP_LEVEL_KEYS = array(
 		'customTemplates',
 		'templateParts',
@@ -272,9 +278,14 @@ class WP_Theme_JSON_Gutenberg {
 	/**
 	 * Constructor.
 	 *
-	 * @param array $theme_json A structure that follows the theme.json schema.
+	 * @param array  $theme_json A structure that follows the theme.json schema.
+	 * @param string $origin What source of data this object represents. One of core, theme, or user. Default: theme.
 	 */
-	public function __construct( $theme_json = array() ) {
+	public function __construct( $theme_json = array(), $origin = 'theme' ) {
+		if ( ! in_array( $origin, self::VALID_ORIGINS, true ) ) {
+			$origin = 'theme';
+		}
+
 		// The old format is not meant to be ported to core.
 		// We can remove it at that point.
 		if ( ! isset( $theme_json['version'] ) || 0 === $theme_json['version'] ) {
@@ -284,6 +295,18 @@ public function __construct( $theme_json = array() ) {
 		$valid_block_names   = array_keys( self::get_blocks_metadata() );
 		$valid_element_names = array_keys( self::ELEMENTS );
 		$this->theme_json    = self::sanitize( $theme_json, $valid_block_names, $valid_element_names );
+
+		// Internally, presets are keyed by origin.
+		$nodes = self::get_setting_nodes( $this->theme_json );
+		foreach ( $nodes as $node ) {
+			foreach ( self::PRESETS_METADATA as $preset ) {
+				$path   = array_merge( $node['path'], $preset['path'] );
+				$preset = _wp_array_get( $this->theme_json, $path, array() );
+				if ( ! empty( $preset ) ) {
+					gutenberg_experimental_set( $this->theme_json, $path, array( $origin => $preset ) );
+				}
+			}
+		}
 	}
 
 	/**
@@ -641,6 +664,33 @@ private static function append_to_selector( $selector, $to_append ) {
 		return implode( ',', $new_selectors );
 	}
 
+	/**
+	 * Function that given an array of presets keyed by origin
+	 * and the value key of the preset returns an array where each key is
+	 * the a preset slug and each value is the preset value.
+	 *
+	 * @param array  $preset_per_origin Array of presets keyed by origin.
+	 * @param string $value_key         The property of the preset that contains its value.
+	 *
+	 * @return array Array of presets where each key is a slug and each value is the preset value.
+	 */
+	private static function get_merged_preset_by_slug( $preset_per_origin, $value_key ) {
+		$result = array();
+		foreach ( self::VALID_ORIGINS as $origin ) {
+			if ( ! isset( $preset_per_origin[ $origin ] ) ) {
+				continue;
+			}
+			foreach ( $preset_per_origin[ $origin ] as $preset ) {
+				// We don't want to use kebabCase here,
+				// see https://github.com/WordPress/gutenberg/issues/32347
+				// However, we need to make sure the generated class or css variable
+				// doesn't contain spaces.
+				$result[ preg_replace( '/\s+/', '-', $preset['slug'] ) ] = $preset[ $value_key ];
+			}
+		}
+		return $result;
+	}
+
 	/**
 	 * Given a settings array, it returns the generated rulesets
 	 * for the preset classes.
@@ -659,19 +709,16 @@ private static function compute_preset_classes( $settings, $selector ) {
 
 		$stylesheet = '';
 		foreach ( self::PRESETS_METADATA as $preset ) {
-			$values = _wp_array_get( $settings, $preset['path'], array() );
-			foreach ( $values as $value ) {
-				foreach ( $preset['classes'] as $class ) {
+			$preset_per_origin = _wp_array_get( $settings, $preset['path'], array() );
+			$preset_by_slug    = self::get_merged_preset_by_slug( $preset_per_origin, $preset['value_key'] );
+			foreach ( $preset['classes'] as $class ) {
+				foreach ( $preset_by_slug as $slug => $value ) {
 					$stylesheet .= self::to_ruleset(
-						// We don't want to use kebabCase here,
-						// see https://github.com/WordPress/gutenberg/issues/32347
-						// However, we need to make sure the generated class
-						// doesn't contain spaces.
-						self::append_to_selector( $selector, '.has-' . preg_replace( '/\s+/', '-', $value['slug'] ) . '-' . $class['class_suffix'] ),
+						self::append_to_selector( $selector, '.has-' . $slug . '-' . $class['class_suffix'] ),
 						array(
 							array(
 								'name'  => $class['property_name'],
-								'value' => $value[ $preset['value_key'] ] . ' !important',
+								'value' => $value . ' !important',
 							),
 						)
 					);
@@ -701,11 +748,12 @@ private static function compute_preset_classes( $settings, $selector ) {
 	private static function compute_preset_vars( $settings ) {
 		$declarations = array();
 		foreach ( self::PRESETS_METADATA as $preset ) {
-			$values = _wp_array_get( $settings, $preset['path'], array() );
-			foreach ( $values as $value ) {
+			$preset_per_origin = _wp_array_get( $settings, $preset['path'], array() );
+			$preset_by_slug    = self::get_merged_preset_by_slug( $preset_per_origin, $preset['value_key'] );
+			foreach ( $preset_by_slug as $slug => $value ) {
 				$declarations[] = array(
-					'name'  => '--wp--preset--' . $preset['css_var_infix'] . '--' . $value['slug'],
-					'value' => $value[ $preset['value_key'] ],
+					'name'  => '--wp--preset--' . $preset['css_var_infix'] . '--' . $slug,
+					'value' => $value,
 				);
 			}
 		}
@@ -1101,86 +1149,35 @@ public function get_stylesheet( $type = 'all' ) {
 	/**
 	 * Merge new incoming data.
 	 *
-	 * @param WP_Theme_JSON_Gutenberg $incoming Data to merge.
-	 * @param string                  $update_or_remove Whether update or remove existing colors
-	 *                                                  for which the incoming data has a duplicated slug.
+	 * @param WP_Theme_JSON $incoming Data to merge.
 	 */
-	public function merge( $incoming, $update_or_remove = 'remove' ) {
-		$incoming_data = $incoming->get_raw_data();
-		$existing_data = $this->theme_json;
+	public function merge( $incoming ) {
+		$incoming_data    = $incoming->get_raw_data();
+		$this->theme_json = array_replace_recursive( $this->theme_json, $incoming_data );
 
 		// The array_replace_recursive algorithm merges at the leaf level.
 		// For leaf values that are arrays it will use the numeric indexes for replacement.
-		$this->theme_json = array_replace_recursive( $this->theme_json, $incoming_data );
-
-		// There are a few cases in which we want to merge things differently
-		// from what array_replace_recursive does.
-
-		// Some incoming properties should replace the existing.
+		// In those cases, we want to replace the existing with the incoming value, if it exists.
 		$to_replace   = array();
 		$to_replace[] = array( 'custom' );
 		$to_replace[] = array( 'spacing', 'units' );
-		$to_replace[] = array( 'typography', 'fontSizes' );
-		$to_replace[] = array( 'typography', 'fontFamilies' );
-
-		// Some others should be appended to the existing.
-		// If the slug is the same than an existing element,
-		// the $update_or_remove param is used to decide
-		// what to do with the existing element:
-		// either remove it and append the incoming,
-		// or update it with the incoming.
-		$to_append   = array();
-		$to_append[] = array( 'color', 'duotone' );
-		$to_append[] = array( 'color', 'gradients' );
-		$to_append[] = array( 'color', 'palette' );
+		$to_replace[] = array( 'color', 'duotone' );
+		foreach ( self::VALID_ORIGINS as $origin ) {
+			$to_replace[] = array( 'color', 'palette', $origin );
+			$to_replace[] = array( 'color', 'gradients', $origin );
+			$to_replace[] = array( 'typography', 'fontSizes', $origin );
+			$to_replace[] = array( 'typography', 'fontFamilies', $origin );
+		}
 
 		$nodes = self::get_setting_nodes( $this->theme_json );
 		foreach ( $nodes as $metadata ) {
-			foreach ( $to_replace as $path_to_replace ) {
-				$path = array_merge( $metadata['path'], $path_to_replace );
+			foreach ( $to_replace as $property_path ) {
+				$path = array_merge( $metadata['path'], $property_path );
 				$node = _wp_array_get( $incoming_data, $path, array() );
 				if ( ! empty( $node ) ) {
 					gutenberg_experimental_set( $this->theme_json, $path, $node );
 				}
 			}
-			foreach ( $to_append as $path_to_append ) {
-				$path          = array_merge( $metadata['path'], $path_to_append );
-				$incoming_node = _wp_array_get( $incoming_data, $path, array() );
-				$existing_node = _wp_array_get( $existing_data, $path, array() );
-
-				if ( empty( $incoming_node ) && empty( $existing_node ) ) {
-					continue;
-				}
-
-				$index_table    = array();
-				$existing_slugs = array();
-				$merged         = array();
-				foreach ( $existing_node as $key => $value ) {
-					$index_table[ $value['slug'] ] = $key;
-					$existing_slugs[]              = $value['slug'];
-					$merged[ $key ]                = $value;
-				}
-
-				$to_remove = array();
-				foreach ( $incoming_node as $value ) {
-					if ( ! in_array( $value['slug'], $existing_slugs, true ) ) {
-						$merged[] = $value;
-					} elseif ( 'update' === $update_or_remove ) {
-						$merged[ $index_table[ $value['slug'] ] ] = $value;
-					} else {
-						$merged[]    = $value;
-						$to_remove[] = $index_table[ $value['slug'] ];
-					}
-				}
-
-				// Remove the duplicated values and pack the sparsed array.
-				foreach ( $to_remove as $index ) {
-					unset( $merged[ $index ] );
-				}
-				$merged = array_values( $merged );
-
-				gutenberg_experimental_set( $this->theme_json, $path, $merged );
-			}
 		}
 
 	}
@@ -1277,14 +1274,26 @@ private static function is_safe_css_declaration( $property_name, $property_value
 
 	/**
 	 * Removes insecure data from theme.json.
+	 *
+	 * @param array $theme_json Structure to sanitize.
+	 *
+	 * @return array Sanitized structure.
 	 */
-	public function remove_insecure_properties() {
+	public static function remove_insecure_properties( $theme_json ) {
 		$sanitized = array();
 
+		if ( ! isset( $theme_json['version'] ) || 0 === $theme_json['version'] ) {
+			$theme_json = WP_Theme_JSON_Schema_V0::parse( $theme_json );
+		}
+
+		$valid_block_names   = array_keys( self::get_blocks_metadata() );
+		$valid_element_names = array_keys( self::ELEMENTS );
+		$theme_json          = self::sanitize( $theme_json, $valid_block_names, $valid_element_names );
+
 		$blocks_metadata = self::get_blocks_metadata();
-		$style_nodes     = self::get_style_nodes( $this->theme_json, $blocks_metadata );
+		$style_nodes     = self::get_style_nodes( $theme_json, $blocks_metadata );
 		foreach ( $style_nodes as $metadata ) {
-			$input = _wp_array_get( $this->theme_json, $metadata['path'], array() );
+			$input = _wp_array_get( $theme_json, $metadata['path'], array() );
 			if ( empty( $input ) ) {
 				continue;
 			}
@@ -1295,9 +1304,9 @@ public function remove_insecure_properties() {
 			}
 		}
 
-		$setting_nodes = self::get_setting_nodes( $this->theme_json );
+		$setting_nodes = self::get_setting_nodes( $theme_json );
 		foreach ( $setting_nodes as $metadata ) {
-			$input = _wp_array_get( $this->theme_json, $metadata['path'], array() );
+			$input = _wp_array_get( $theme_json, $metadata['path'], array() );
 			if ( empty( $input ) ) {
 				continue;
 			}
@@ -1309,17 +1318,18 @@ public function remove_insecure_properties() {
 		}
 
 		if ( empty( $sanitized['styles'] ) ) {
-			unset( $this->theme_json['styles'] );
+			unset( $theme_json['styles'] );
 		} else {
-			$this->theme_json['styles'] = $sanitized['styles'];
+			$theme_json['styles'] = $sanitized['styles'];
 		}
 
 		if ( empty( $sanitized['settings'] ) ) {
-			unset( $this->theme_json['settings'] );
+			unset( $theme_json['settings'] );
 		} else {
-			$this->theme_json['settings'] = $sanitized['settings'];
+			$theme_json['settings'] = $sanitized['settings'];
 		}
 
+		return $theme_json;
 	}
 
 	/**
diff --git a/lib/class-wp-theme-json-resolver-gutenberg.php b/lib/class-wp-theme-json-resolver-gutenberg.php
index bcdedda86f30b7..1f6cfe6d30ce85 100644
--- a/lib/class-wp-theme-json-resolver-gutenberg.php
+++ b/lib/class-wp-theme-json-resolver-gutenberg.php
@@ -250,7 +250,7 @@ public static function get_core_data() {
 
 		$config     = self::read_json_file( __DIR__ . '/experimental-default-theme.json' );
 		$config     = self::translate( $config );
-		self::$core = new WP_Theme_JSON_Gutenberg( $config );
+		self::$core = new WP_Theme_JSON_Gutenberg( $config, 'core' );
 
 		return self::$core;
 	}
@@ -368,7 +368,7 @@ public static function get_user_data() {
 			$json_decoding_error = json_last_error();
 			if ( JSON_ERROR_NONE !== $json_decoding_error ) {
 				trigger_error( 'Error when decoding a theme.json schema for user data. ' . json_last_error_msg() );
-				return new WP_Theme_JSON_Gutenberg( $config );
+				return new WP_Theme_JSON_Gutenberg( $config, 'user' );
 			}
 
 			// Very important to verify if the flag isGlobalStylesUserThemeJSON is true.
@@ -382,7 +382,7 @@ public static function get_user_data() {
 				$config = $decoded_data;
 			}
 		}
-		self::$user = new WP_Theme_JSON_Gutenberg( $config );
+		self::$user = new WP_Theme_JSON_Gutenberg( $config, 'user' );
 
 		return self::$user;
 	}
@@ -419,7 +419,7 @@ public static function get_merged_data( $settings = array(), $origin = 'user' )
 		$result->merge( self::get_theme_data( $theme_support_data ) );
 
 		if ( 'user' === $origin ) {
-			$result->merge( self::get_user_data(), 'update' );
+			$result->merge( self::get_user_data() );
 		}
 
 		return $result;
diff --git a/lib/client-assets.php b/lib/client-assets.php
index c52c5ae04f2b04..3a366796d6218c 100644
--- a/lib/client-assets.php
+++ b/lib/client-assets.php
@@ -447,7 +447,7 @@ function gutenberg_register_packages_styles( $styles ) {
 		$styles,
 		'wp-edit-widgets',
 		gutenberg_url( 'build/edit-widgets/style.css' ),
-		array( 'wp-components', 'wp-block-editor', 'wp-edit-blocks', 'wp-reusable-blocks' ),
+		array( 'wp-components', 'wp-block-editor', 'wp-edit-blocks', 'wp-reusable-blocks', 'wp-widgets' ),
 		$version
 	);
 	$styles->add_data( 'wp-edit-widgets', 'rtl', 'replace' );
@@ -465,7 +465,7 @@ function gutenberg_register_packages_styles( $styles ) {
 		$styles,
 		'wp-customize-widgets',
 		gutenberg_url( 'build/customize-widgets/style.css' ),
-		array( 'wp-components', 'wp-block-editor', 'wp-edit-blocks' ),
+		array( 'wp-components', 'wp-block-editor', 'wp-edit-blocks', 'wp-widgets' ),
 		$version
 	);
 	$styles->add_data( 'wp-customize-widgets', 'rtl', 'replace' );
@@ -478,6 +478,14 @@ function gutenberg_register_packages_styles( $styles ) {
 		$version
 	);
 	$styles->add_data( 'wp-reusable-block', 'rtl', 'replace' );
+
+	gutenberg_override_style(
+		$styles,
+		'wp-widgets',
+		gutenberg_url( 'build/widgets/style.css' ),
+		array( 'wp-components' )
+	);
+	$styles->add_data( 'wp-widgets', 'rtl', 'replace' );
 }
 add_action( 'wp_default_styles', 'gutenberg_register_packages_styles' );
 
diff --git a/lib/experimental-default-theme.json b/lib/experimental-default-theme.json
index dc4dbbaf058529..d92547a1468952 100644
--- a/lib/experimental-default-theme.json
+++ b/lib/experimental-default-theme.json
@@ -6,148 +6,124 @@
 				{
 					"name": "Black",
 					"slug": "black",
-					"color": "#000000",
-					"origin": "core"
+					"color": "#000000"
 				},
 				{
 					"name": "Cyan bluish gray",
 					"slug": "cyan-bluish-gray",
-					"color": "#abb8c3",
-					"origin": "core"
+					"color": "#abb8c3"
 				},
 				{
 					"name": "White",
 					"slug": "white",
-					"color": "#ffffff",
-					"origin": "core"
+					"color": "#ffffff"
 				},
 				{
 					"name": "Pale pink",
 					"slug": "pale-pink",
-					"color": "#f78da7",
-					"origin": "core"
+					"color": "#f78da7"
 				},
 				{
 					"name": "Vivid red",
 					"slug": "vivid-red",
-					"color": "#cf2e2e",
-					"origin": "core"
+					"color": "#cf2e2e"
 				},
 				{
 					"name": "Luminous vivid orange",
 					"slug": "luminous-vivid-orange",
-					"color": "#ff6900",
-					"origin": "core"
+					"color": "#ff6900"
 				},
 				{
 					"name": "Luminous vivid amber",
 					"slug": "luminous-vivid-amber",
-					"color": "#fcb900",
-					"origin": "core"
+					"color": "#fcb900"
 				},
 				{
 					"name": "Light green cyan",
 					"slug": "light-green-cyan",
-					"color": "#7bdcb5",
-					"origin": "core"
+					"color": "#7bdcb5"
 				},
 				{
 					"name": "Vivid green cyan",
 					"slug": "vivid-green-cyan",
-					"color": "#00d084",
-					"origin": "core"
+					"color": "#00d084"
 				},
 				{
 					"name": "Pale cyan blue",
 					"slug": "pale-cyan-blue",
-					"color": "#8ed1fc",
-					"origin": "core"
+					"color": "#8ed1fc"
 				},
 				{
 					"name": "Vivid cyan blue",
 					"slug": "vivid-cyan-blue",
-					"color": "#0693e3",
-					"origin": "core"
+					"color": "#0693e3"
 				},
 				{
 					"name": "Vivid purple",
 					"slug": "vivid-purple",
-					"color": "#9b51e0",
-					"origin": "core"
+					"color": "#9b51e0"
 				}
 			],
 			"gradients": [
 				{
 					"name": "Vivid cyan blue to vivid purple",
 					"gradient": "linear-gradient(135deg,rgba(6,147,227,1) 0%,rgb(155,81,224) 100%)",
-					"slug": "vivid-cyan-blue-to-vivid-purple",
-					"origin": "core"
+					"slug": "vivid-cyan-blue-to-vivid-purple"
 				},
 				{
 					"name": "Light green cyan to vivid green cyan",
 					"gradient": "linear-gradient(135deg,rgb(122,220,180) 0%,rgb(0,208,130) 100%)",
-					"slug": "light-green-cyan-to-vivid-green-cyan",
-					"origin": "core"
+					"slug": "light-green-cyan-to-vivid-green-cyan"
 				},
 				{
 					"name": "Luminous vivid amber to luminous vivid orange",
 					"gradient": "linear-gradient(135deg,rgba(252,185,0,1) 0%,rgba(255,105,0,1) 100%)",
-					"slug": "luminous-vivid-amber-to-luminous-vivid-orange",
-					"origin": "core"
+					"slug": "luminous-vivid-amber-to-luminous-vivid-orange"
 				},
 				{
 					"name": "Luminous vivid orange to vivid red",
 					"gradient": "linear-gradient(135deg,rgba(255,105,0,1) 0%,rgb(207,46,46) 100%)",
-					"slug": "luminous-vivid-orange-to-vivid-red",
-					"origin": "core"
+					"slug": "luminous-vivid-orange-to-vivid-red"
 				},
 				{
 					"name": "Very light gray to cyan bluish gray",
 					"gradient": "linear-gradient(135deg,rgb(238,238,238) 0%,rgb(169,184,195) 100%)",
-					"slug": "very-light-gray-to-cyan-bluish-gray",
-					"origin": "core"
+					"slug": "very-light-gray-to-cyan-bluish-gray"
 				},
 				{
 					"name": "Cool to warm spectrum",
 					"gradient": "linear-gradient(135deg,rgb(74,234,220) 0%,rgb(151,120,209) 20%,rgb(207,42,186) 40%,rgb(238,44,130) 60%,rgb(251,105,98) 80%,rgb(254,248,76) 100%)",
-					"slug": "cool-to-warm-spectrum",
-					"origin": "core"
+					"slug": "cool-to-warm-spectrum"
 				},
 				{
 					"name": "Blush light purple",
 					"gradient": "linear-gradient(135deg,rgb(255,206,236) 0%,rgb(152,150,240) 100%)",
-					"slug": "blush-light-purple",
-					"origin": "core"
+					"slug": "blush-light-purple"
 				},
 				{
 					"name": "Blush bordeaux",
 					"gradient": "linear-gradient(135deg,rgb(254,205,165) 0%,rgb(254,45,45) 50%,rgb(107,0,62) 100%)",
-					"slug": "blush-bordeaux",
-					"origin": "core"
+					"slug": "blush-bordeaux"
 				},
 				{
 					"name": "Luminous dusk",
 					"gradient": "linear-gradient(135deg,rgb(255,203,112) 0%,rgb(199,81,192) 50%,rgb(65,88,208) 100%)",
-					"slug": "luminous-dusk",
-					"origin": "core"
+					"slug": "luminous-dusk"
 				},
 				{
 					"name": "Pale ocean",
 					"gradient": "linear-gradient(135deg,rgb(255,245,203) 0%,rgb(182,227,212) 50%,rgb(51,167,181) 100%)",
-					"slug": "pale-ocean",
-					"origin": "core"
+					"slug": "pale-ocean"
 				},
 				{
 					"name": "Electric grass",
 					"gradient": "linear-gradient(135deg,rgb(202,248,128) 0%,rgb(113,206,126) 100%)",
-					"slug": "electric-grass",
-					"origin": "core"
+					"slug": "electric-grass"
 				},
 				{
 					"name": "Midnight",
 					"gradient": "linear-gradient(135deg,rgb(2,3,129) 0%,rgb(40,116,252) 100%)",
-					"slug": "midnight",
-					"origin": "core"
+					"slug": "midnight"
 				}
 			],
 			"duotone": [
diff --git a/lib/full-site-editing/templates.php b/lib/full-site-editing/templates.php
index e6f185bda76bb2..d6ee991fc503cc 100644
--- a/lib/full-site-editing/templates.php
+++ b/lib/full-site-editing/templates.php
@@ -199,11 +199,21 @@ function set_unique_slug_on_create_template( $post_id ) {
  * @return void
  */
 function gutenberg_the_skip_link() {
+	// Early exit if on WP 5.8+.
+	if ( function_exists( 'the_block_template_skip_link' ) ) {
+		return;
+	}
 
-	// Early exit if not an FSE theme.
+	// Early exit if not a block theme.
 	if ( ! gutenberg_supports_block_templates() ) {
 		return;
 	}
+
+	// Early exit if not a block template.
+	global $_wp_current_template_content;
+	if ( ! $_wp_current_template_content ) {
+		return;
+	}
 	?>
 
 	<?php
@@ -261,7 +271,12 @@ function gutenberg_the_skip_link() {
 
 		// Get the site wrapper.
 		// The skip-link will be injected in the beginning of it.
-		parentEl = document.querySelector( '.wp-site-blocks' ) || document.body,
+		parentEl = document.querySelector( '.wp-site-blocks' );
+
+		// Early exit if the root element was not found.
+		if ( ! parentEl ) {
+			return;
+		}
 
 		// Get the skip-link target's ID, and generate one if it doesn't exist.
 		skipLinkTargetID = skipLinkTarget.id;
diff --git a/lib/global-styles.php b/lib/global-styles.php
index 2aa5c1b104538c..31b3316360ed5a 100644
--- a/lib/global-styles.php
+++ b/lib/global-styles.php
@@ -136,14 +136,37 @@ function_exists( 'gutenberg_is_edit_site_page' ) &&
 
 	// Copied from get_block_editor_settings() at wordpress-develop/block-editor.php.
 	$settings['__experimentalFeatures'] = $consolidated->get_settings();
+
 	if ( isset( $settings['__experimentalFeatures']['color']['palette'] ) ) {
-		$settings['colors'] = $settings['__experimentalFeatures']['color']['palette'];
-		unset( $settings['__experimentalFeatures']['color']['palette'] );
+		$colors_by_origin   = $settings['__experimentalFeatures']['color']['palette'];
+		$settings['colors'] = isset( $colors_by_origin['user'] ) ?
+			$colors_by_origin['user'] : (
+				isset( $colors_by_origin['theme'] ) ?
+					$colors_by_origin['theme'] :
+					$colors_by_origin['core']
+			);
 	}
+
 	if ( isset( $settings['__experimentalFeatures']['color']['gradients'] ) ) {
-		$settings['gradients'] = $settings['__experimentalFeatures']['color']['gradients'];
-		unset( $settings['__experimentalFeatures']['color']['gradients'] );
+		$gradients_by_origin   = $settings['__experimentalFeatures']['color']['gradients'];
+		$settings['gradients'] = isset( $gradients_by_origin['user'] ) ?
+			$gradients_by_origin['user'] : (
+				isset( $gradients_by_origin['theme'] ) ?
+					$gradients_by_origin['theme'] :
+					$gradients_by_origin['core']
+			);
+	}
+
+	if ( isset( $settings['__experimentalFeatures']['typography']['fontSizes'] ) ) {
+		$font_sizes_by_origin  = $settings['__experimentalFeatures']['typography']['fontSizes'];
+		$settings['fontSizes'] = isset( $font_sizes_by_origin['user'] ) ?
+			$font_sizes_by_origin['user'] : (
+				isset( $font_sizes_by_origin['theme'] ) ?
+					$font_sizes_by_origin['theme'] :
+					$font_sizes_by_origin['core']
+			);
 	}
+
 	if ( isset( $settings['__experimentalFeatures']['color']['custom'] ) ) {
 		$settings['disableCustomColors'] = ! $settings['__experimentalFeatures']['color']['custom'];
 		unset( $settings['__experimentalFeatures']['color']['custom'] );
@@ -152,10 +175,6 @@ function_exists( 'gutenberg_is_edit_site_page' ) &&
 		$settings['disableCustomGradients'] = ! $settings['__experimentalFeatures']['color']['customGradient'];
 		unset( $settings['__experimentalFeatures']['color']['customGradient'] );
 	}
-	if ( isset( $settings['__experimentalFeatures']['typography']['fontSizes'] ) ) {
-		$settings['fontSizes'] = $settings['__experimentalFeatures']['typography']['fontSizes'];
-		unset( $settings['__experimentalFeatures']['typography']['fontSizes'] );
-	}
 	if ( isset( $settings['__experimentalFeatures']['typography']['customFontSize'] ) ) {
 		$settings['disableCustomFontSizes'] = ! $settings['__experimentalFeatures']['typography']['customFontSize'];
 		unset( $settings['__experimentalFeatures']['typography']['customFontSize'] );
@@ -209,9 +228,9 @@ function gutenberg_global_styles_filter_post( $content ) {
 		$decoded_data['isGlobalStylesUserThemeJSON']
 	) {
 		unset( $decoded_data['isGlobalStylesUserThemeJSON'] );
-		$theme_json = new WP_Theme_JSON_Gutenberg( $decoded_data );
-		$theme_json->remove_insecure_properties();
-		$data_to_encode                                = $theme_json->get_raw_data();
+
+		$data_to_encode = WP_Theme_JSON_Gutenberg::remove_insecure_properties( $decoded_data );
+
 		$data_to_encode['isGlobalStylesUserThemeJSON'] = true;
 		return wp_json_encode( $data_to_encode );
 	}
diff --git a/lib/widgets-page.php b/lib/widgets-page.php
index 06376c2c71e396..1a4089eea66fd7 100644
--- a/lib/widgets-page.php
+++ b/lib/widgets-page.php
@@ -103,3 +103,59 @@ function gutenberg_widgets_editor_load_block_editor_scripts_and_styles( $is_bloc
 function gutenberg_widgets_editor_add_admin_body_classes( $classes ) {
 	return "$classes block-editor-page wp-embed-responsive";
 }
+
+/**
+ * Emulates the Widgets screen `admin_print_styles` when at the block editor
+ * screen.
+ */
+function gutenberg_block_editor_admin_print_styles() {
+	if ( is_callable( 'get_current_screen' ) && 'appearance_page_gutenberg-widgets' === get_current_screen()->base ) {
+		/** This action is documented in wp-admin/admin-footer.php */
+		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
+		do_action( 'admin_print_styles-widgets.php' );
+	}
+}
+add_action( 'admin_print_styles', 'gutenberg_block_editor_admin_print_styles' );
+
+/**
+ * Emulates the Widgets screen `admin_print_scripts` when at the block editor
+ * screen.
+ */
+function gutenberg_block_editor_admin_print_scripts() {
+	if ( is_callable( 'get_current_screen' ) && 'appearance_page_gutenberg-widgets' === get_current_screen()->base ) {
+		/** This action is documented in wp-admin/includes/ajax-actions.php */
+		do_action( 'load-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
+		/** This action is documented in wp-admin/includes/ajax-actions.php */
+		do_action( 'widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
+		/** This action is documented in wp-admin/widgets.php */
+		do_action( 'sidebar_admin_setup' );
+		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
+		do_action( 'admin_print_scripts-widgets.php' );
+	}
+}
+add_action( 'admin_print_scripts', 'gutenberg_block_editor_admin_print_scripts' );
+
+/**
+ * Emulates the Widgets screen `admin_print_footer_scripts` when at the block
+ * editor screen.
+ */
+function gutenberg_block_editor_admin_print_footer_scripts() {
+	if ( is_callable( 'get_current_screen' ) && 'appearance_page_gutenberg-widgets' === get_current_screen()->base ) {
+		/** This action is documented in wp-admin/admin-footer.php */
+		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
+		do_action( 'admin_print_footer_scripts-widgets.php' );
+	}
+}
+add_action( 'admin_print_footer_scripts', 'gutenberg_block_editor_admin_print_footer_scripts' );
+
+/**
+ * Emulates the Widgets screen `admin_footer` when at the block editor screen.
+ */
+function gutenberg_block_editor_admin_footer() {
+	if ( is_callable( 'get_current_screen' ) && 'appearance_page_gutenberg-widgets' === get_current_screen()->base ) {
+		/** This action is documented in wp-admin/admin-footer.php */
+		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
+		do_action( 'admin_footer-widgets.php' );
+	}
+}
+add_action( 'admin_footer', 'gutenberg_block_editor_admin_footer' );
diff --git a/lib/widgets.php b/lib/widgets.php
index c61d2c1106edc6..314b4f30c2ff8b 100644
--- a/lib/widgets.php
+++ b/lib/widgets.php
@@ -11,6 +11,12 @@
  * @return boolean True if a screen containing the block editor is being loaded.
  */
 function gutenberg_is_block_editor() {
+	_deprecated_function(
+		'gutenberg_is_block_editor',
+		'10.8',
+		'WP_Screen::is_block_editor'
+	);
+
 	// If get_current_screen does not exist, we are neither in the standard block editor for posts, or the widget block editor.
 	// We can safely return false.
 	if ( ! function_exists( 'get_current_screen' ) ) {
@@ -44,79 +50,6 @@ function gutenberg_use_widgets_block_editor() {
 	);
 }
 
-/**
- * Emulates the Widgets screen `admin_print_styles` when at the block editor
- * screen.
- */
-function gutenberg_block_editor_admin_print_styles() {
-	if ( gutenberg_is_block_editor() ) {
-		/** This action is documented in wp-admin/admin-footer.php */
-		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
-		do_action( 'admin_print_styles-widgets.php' );
-	}
-}
-add_action( 'admin_print_styles', 'gutenberg_block_editor_admin_print_styles' );
-
-/**
- * Emulates the Widgets screen `admin_print_scripts` when at the block editor
- * screen.
- */
-function gutenberg_block_editor_admin_print_scripts() {
-	if ( gutenberg_is_block_editor() ) {
-		/** This action is documented in wp-admin/includes/ajax-actions.php */
-		do_action( 'load-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
-		/** This action is documented in wp-admin/includes/ajax-actions.php */
-		do_action( 'widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
-		/** This action is documented in wp-admin/widgets.php */
-		do_action( 'sidebar_admin_setup' );
-		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
-		do_action( 'admin_print_scripts-widgets.php' );
-	}
-}
-add_action( 'admin_print_scripts', 'gutenberg_block_editor_admin_print_scripts' );
-
-/**
- * Emulates the Widgets screen `admin_print_footer_scripts` when at the block
- * editor screen.
- */
-function gutenberg_block_editor_admin_print_footer_scripts() {
-	if ( gutenberg_is_block_editor() ) {
-		/** This action is documented in wp-admin/admin-footer.php */
-		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
-		do_action( 'admin_print_footer_scripts-widgets.php' );
-	}
-}
-add_action( 'admin_print_footer_scripts', 'gutenberg_block_editor_admin_print_footer_scripts' );
-
-/**
- * Emulates the Widgets screen `admin_footer` when at the block editor screen.
- */
-function gutenberg_block_editor_admin_footer() {
-	if ( gutenberg_is_block_editor() ) {
-		/** This action is documented in wp-admin/admin-footer.php */
-		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
-		do_action( 'admin_footer-widgets.php' );
-	}
-}
-add_action( 'admin_footer', 'gutenberg_block_editor_admin_footer' );
-
-/**
- * Adds a save widgets nonce required by the legacy widgets block.
- */
-function gutenberg_print_save_widgets_nonce() {
-	// The function wpWidgets.save needs this nonce to work as expected.
-	echo implode(
-		"\n",
-		array(
-			'<form method="post">',
-			wp_nonce_field( 'save-sidebar-widgets', '_wpnonce_widgets', false ),
-			'</form>',
-		)
-	);
-}
-add_action( 'admin_footer-widgets.php', 'gutenberg_print_save_widgets_nonce' );
-
-
 /**
  * Returns the settings required by legacy widgets blocks.
  *
@@ -137,7 +70,6 @@ function gutenberg_get_legacy_widget_settings() {
 			'media_image',
 			'media_gallery',
 			'media_video',
-			'meta',
 			'search',
 			'text',
 			'categories',
@@ -151,90 +83,11 @@ function gutenberg_get_legacy_widget_settings() {
 		)
 	);
 
-	// Backwards compatibility. Remove this in or after Gutenberg 10.5.
-	if ( has_filter( 'widgets_to_exclude_from_legacy_widget_block' ) ) {
-		/**
-		 * Filters the list of widget classes that should **not** be offered by the legacy widget block.
-		 *
-		 * Returning an empty array will make all the widgets available.
-		 *
-		 * @param array $widgets An array of excluded widgets classnames.
-		 *
-		 * @since 5.6.0
-		 */
-		$widgets_to_exclude_from_legacy_widget_block = apply_filters(
-			'widgets_to_exclude_from_legacy_widget_block',
-			array(
-				'WP_Widget_Block',
-				'WP_Widget_Pages',
-				'WP_Widget_Calendar',
-				'WP_Widget_Archives',
-				'WP_Widget_Media_Audio',
-				'WP_Widget_Media_Image',
-				'WP_Widget_Media_Gallery',
-				'WP_Widget_Media_Video',
-				'WP_Widget_Meta',
-				'WP_Widget_Search',
-				'WP_Widget_Text',
-				'WP_Widget_Categories',
-				'WP_Widget_Recent_Posts',
-				'WP_Widget_Recent_Comments',
-				'WP_Widget_RSS',
-				'WP_Widget_Tag_Cloud',
-				'WP_Nav_Menu_Widget',
-				'WP_Widget_Custom_HTML',
-			)
-		);
-
-		_deprecated_hook(
-			'widgets_to_exclude_from_legacy_widget_block',
-			'10.3',
-			"wp.hooks.addFilter( 'legacyWidget.isWidgetTypeHidden', ... )"
-		);
-
-		foreach ( $wp_widget_factory->widgets as $widget ) {
-			if (
-				in_array( get_class( $widget ), $widgets_to_exclude_from_legacy_widget_block, true ) &&
-				! in_array( $widget->id_base, $widget_types_to_hide_from_legacy_widget_block, true )
-			) {
-				$widget_types_to_hide_from_legacy_widget_block[] = $widget->id_base;
-			}
-		}
-	}
-
 	$settings['widgetTypesToHideFromLegacyWidgetBlock'] = $widget_types_to_hide_from_legacy_widget_block;
 
 	return $settings;
 }
 
-/**
- * Extends default editor settings with values supporting legacy widgets.
- *
- * This can be removed when plugin support requires WordPress 5.8.0+.
- *
- * @param array $settings Default editor settings.
- *
- * @return array Filtered editor settings.
- */
-function gutenberg_legacy_widget_settings( $settings ) {
-	return array_merge( $settings, gutenberg_get_legacy_widget_settings() );
-}
-// This can be removed when plugin support requires WordPress 5.8.0+.
-if ( function_exists( 'get_block_editor_settings' ) ) {
-	add_filter( 'block_editor_settings_all', 'gutenberg_legacy_widget_settings' );
-} else {
-	add_filter( 'block_editor_settings', 'gutenberg_legacy_widget_settings' );
-}
-
-/**
- * Function to enqueue admin-widgets as part of the block editor assets.
- */
-function gutenberg_enqueue_widget_scripts() {
-	wp_enqueue_script( 'admin-widgets' );
-}
-
-add_action( 'enqueue_block_editor_assets', 'gutenberg_enqueue_widget_scripts' );
-
 /**
  * Overrides dynamic_sidebar_params to make sure Blocks are not wrapped in <form> tag.
  *
@@ -308,4 +161,7 @@ function gutenberg_set_show_instance_in_rest_on_core_widgets() {
 		}
 	}
 }
-add_action( 'widgets_init', 'gutenberg_set_show_instance_in_rest_on_core_widgets' );
+
+if ( ! function_exists( 'wp_use_widgets_block_editor' ) ) {
+	add_action( 'widgets_init', 'gutenberg_set_show_instance_in_rest_on_core_widgets' );
+}
diff --git a/package-lock.json b/package-lock.json
index 5254251b971ef4..a6961d1e495acc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14279,12 +14279,20 @@
 			"version": "file:packages/widgets",
 			"requires": {
 				"@babel/runtime": "^7.13.10",
+				"@wordpress/api-fetch": "file:packages/api-fetch",
+				"@wordpress/block-editor": "file:packages/block-editor",
 				"@wordpress/blocks": "file:packages/blocks",
 				"@wordpress/components": "file:packages/components",
+				"@wordpress/compose": "file:packages/compose",
 				"@wordpress/core-data": "file:packages/core-data",
 				"@wordpress/data": "file:packages/data",
+				"@wordpress/element": "file:packages/element",
 				"@wordpress/i18n": "file:packages/i18n",
-				"@wordpress/icons": "file:packages/icons"
+				"@wordpress/icons": "file:packages/icons",
+				"@wordpress/notices": "file:packages/notices",
+				"@wordpress/url": "file:packages/url",
+				"classnames": "^2.2.5",
+				"lodash": "^4.17.21"
 			}
 		},
 		"@wordpress/wordcount": {
diff --git a/packages/block-editor/CHANGELOG.md b/packages/block-editor/CHANGELOG.md
index 73badf8f522fab..d143158c96b437 100644
--- a/packages/block-editor/CHANGELOG.md
+++ b/packages/block-editor/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### New Features
+
+-   `ButtonBlockerAppender` is now `ButtonBlockAppender`, the original name was a typo, but is still being exported for backward compatibility.
+
 ## 6.1.0 (2021-05-20)
 
 ## 6.0.0 (2021-05-14)
diff --git a/packages/block-editor/README.md b/packages/block-editor/README.md
index 9ecd72ea0cb307..a8a19f6f830211 100644
--- a/packages/block-editor/README.md
+++ b/packages/block-editor/README.md
@@ -104,6 +104,11 @@ Undocumented declaration.
 
 Block breadcrumb component, displaying the hierarchy of the current block selection as a breadcrumb.
 
+_Parameters_
+
+-   _props_ `Object`: Component props.
+-   _props.rootLabelText_ `string`: Translated label for the root element of the breadcrumb trail.
+
 _Returns_
 
 -   `WPElement`: Block Breadcrumb.
@@ -248,12 +253,18 @@ Undocumented declaration.
 
 Undocumented declaration.
 
-<a name="ButtonBlockerAppender" href="#ButtonBlockerAppender">#</a> **ButtonBlockerAppender**
+<a name="ButtonBlockAppender" href="#ButtonBlockAppender">#</a> **ButtonBlockAppender**
 
 _Related_
 
 -   <https://github.com/WordPress/gutenberg/blob/HEAD/packages/block-editor/src/components/button-block-appender/README.md>
 
+<a name="ButtonBlockerAppender" href="#ButtonBlockerAppender">#</a> **ButtonBlockerAppender**
+
+> **Deprecated** 
+
+Use `ButtonBlockAppender` instead.
+
 <a name="ColorPalette" href="#ColorPalette">#</a> **ColorPalette**
 
 Undocumented declaration.
diff --git a/packages/block-editor/src/components/block-breadcrumb/README.md b/packages/block-editor/src/components/block-breadcrumb/README.md
index 98b432973b33d9..298ff8fdf5ea61 100644
--- a/packages/block-editor/src/components/block-breadcrumb/README.md
+++ b/packages/block-editor/src/components/block-breadcrumb/README.md
@@ -13,6 +13,15 @@ The block breadcrumb trail displays the hierarchy of the current block selection
 
 ## Development guidelines
 
+#### Props
+
+##### rootLabelText
+
+Label text for the root element (the first `<li />`) of the breadcrumb trail.
+
+-   Type: `String`
+-   Required: No
+
 ### Usage
 
 Renders a block breadcrumb with default style.
diff --git a/packages/block-editor/src/components/block-breadcrumb/index.js b/packages/block-editor/src/components/block-breadcrumb/index.js
index 422fbeffc0ed5d..bfc4b45303889d 100644
--- a/packages/block-editor/src/components/block-breadcrumb/index.js
+++ b/packages/block-editor/src/components/block-breadcrumb/index.js
@@ -14,9 +14,11 @@ import { store as blockEditorStore } from '../../store';
 /**
  * Block breadcrumb component, displaying the hierarchy of the current block selection as a breadcrumb.
  *
- * @return {WPElement} Block Breadcrumb.
+ * @param  {Object}   props               Component props.
+ * @param  {string}   props.rootLabelText Translated label for the root element of the breadcrumb trail.
+ * @return {WPElement}                    Block Breadcrumb.
  */
-function BlockBreadcrumb() {
+function BlockBreadcrumb( { rootLabelText } ) {
 	const { selectBlock, clearSelectedBlock } = useDispatch( blockEditorStore );
 	const { clientId, parents, hasSelection } = useSelect( ( select ) => {
 		const {
@@ -31,6 +33,7 @@ function BlockBreadcrumb() {
 			hasSelection: !! getSelectionStart().clientId,
 		};
 	}, [] );
+	const rootLabel = rootLabelText || __( 'Document' );
 
 	/*
 	 * Disable reason: The `list` ARIA role is redundant but
@@ -57,10 +60,10 @@ function BlockBreadcrumb() {
 						isTertiary
 						onClick={ clearSelectedBlock }
 					>
-						{ __( 'Document' ) }
+						{ rootLabel }
 					</Button>
 				) }
-				{ ! hasSelection && __( 'Document' ) }
+				{ ! hasSelection && rootLabel }
 			</li>
 			{ parents.map( ( parentClientId ) => (
 				<li key={ parentClientId }>
diff --git a/packages/block-editor/src/components/block-breadcrumb/test/__snapshots__/index.js.snap b/packages/block-editor/src/components/block-breadcrumb/test/__snapshots__/index.js.snap
new file mode 100644
index 00000000000000..85dd26bc0a7f3b
--- /dev/null
+++ b/packages/block-editor/src/components/block-breadcrumb/test/__snapshots__/index.js.snap
@@ -0,0 +1,16 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`BlockBreadcrumb should render correctly 1`] = `
+<ul
+  aria-label="Block breadcrumb"
+  class="block-editor-block-breadcrumb"
+  role="list"
+>
+  <li
+    aria-current="true"
+    class="block-editor-block-breadcrumb__current"
+  >
+    Document
+  </li>
+</ul>
+`;
diff --git a/packages/block-editor/src/components/block-breadcrumb/test/index.js b/packages/block-editor/src/components/block-breadcrumb/test/index.js
new file mode 100644
index 00000000000000..a46392920b5fcb
--- /dev/null
+++ b/packages/block-editor/src/components/block-breadcrumb/test/index.js
@@ -0,0 +1,37 @@
+/**
+ * External dependencies
+ */
+import { render, screen } from '@testing-library/react';
+
+/**
+ * Internal dependencies
+ */
+import BlockBreadcrumb from '../';
+
+describe( 'BlockBreadcrumb', () => {
+	it( 'should render correctly', () => {
+		const { container } = render( <BlockBreadcrumb /> );
+
+		expect( container.firstChild ).toMatchSnapshot();
+	} );
+
+	describe( 'Root label text', () => {
+		test( 'should display default label of "Document"', () => {
+			render( <BlockBreadcrumb /> );
+
+			const rootLabelTextDefault = screen.getByText( 'Document' );
+
+			expect( rootLabelTextDefault ).toBeInTheDocument();
+		} );
+
+		test( 'should display `rootLabelText` value', () => {
+			render( <BlockBreadcrumb rootLabelText="Tuhinga" /> );
+
+			const rootLabelText = screen.getByText( 'Tuhinga' );
+			const rootLabelTextDefault = screen.queryByText( 'Document' );
+
+			expect( rootLabelTextDefault ).toBeNull();
+			expect( rootLabelText ).toBeInTheDocument();
+		} );
+	} );
+} );
diff --git a/packages/block-editor/src/components/block-list/index.js b/packages/block-editor/src/components/block-list/index.js
index 96e46284d6b95d..46e5d56f9f0317 100644
--- a/packages/block-editor/src/components/block-list/index.js
+++ b/packages/block-editor/src/components/block-list/index.js
@@ -27,25 +27,20 @@ export const IntersectionObserver = createContext();
 
 function Root( { className, children } ) {
 	const isLargeViewport = useViewportMatch( 'medium' );
-	const {
-		isTyping,
-		isOutlineMode,
-		isFocusMode,
-		isNavigationMode,
-	} = useSelect( ( select ) => {
-		const {
-			isTyping: _isTyping,
-			getSettings,
-			isNavigationMode: _isNavigationMode,
-		} = select( blockEditorStore );
-		const { outlineMode, focusMode } = getSettings();
-		return {
-			isTyping: _isTyping(),
-			isOutlineMode: outlineMode,
-			isFocusMode: focusMode,
-			isNavigationMode: _isNavigationMode(),
-		};
-	}, [] );
+	const { isOutlineMode, isFocusMode, isNavigationMode } = useSelect(
+		( select ) => {
+			const { getSettings, isNavigationMode: _isNavigationMode } = select(
+				blockEditorStore
+			);
+			const { outlineMode, focusMode } = getSettings();
+			return {
+				isOutlineMode: outlineMode,
+				isFocusMode: focusMode,
+				isNavigationMode: _isNavigationMode(),
+			};
+		},
+		[]
+	);
 	return (
 		<div
 			ref={ useMergeRefs( [
@@ -57,7 +52,6 @@ function Root( { className, children } ) {
 				'block-editor-block-list__layout is-root-container',
 				className,
 				{
-					'is-typing': isTyping,
 					'is-outline-mode': isOutlineMode,
 					'is-focus-mode': isFocusMode && isLargeViewport,
 					'is-navigate-mode': isNavigationMode,
@@ -69,12 +63,12 @@ function Root( { className, children } ) {
 	);
 }
 
-export default function BlockList( { className, __experimentalLayout } ) {
+export default function BlockList( { className, ...props } ) {
 	usePreParsePatterns();
 	return (
 		<BlockToolsBackCompat>
 			<Root className={ className }>
-				<BlockListItems __experimentalLayout={ __experimentalLayout } />
+				<BlockListItems { ...props } />
 			</Root>
 		</BlockToolsBackCompat>
 	);
diff --git a/packages/block-editor/src/components/block-list/style.scss b/packages/block-editor/src/components/block-list/style.scss
index ebe5d59097395d..e579e7d7786048 100644
--- a/packages/block-editor/src/components/block-list/style.scss
+++ b/packages/block-editor/src/components/block-list/style.scss
@@ -257,7 +257,7 @@
 	}
 }
 
-.is-outline-mode:not(.is-typing) .block-editor-block-list__block {
+.is-outline-mode .block-editor-block-list__block:not(.remove-outline) {
 	&.is-hovered {
 		cursor: default;
 
diff --git a/packages/block-editor/src/components/block-list/use-block-props/use-block-class-names.js b/packages/block-editor/src/components/block-list/use-block-props/use-block-class-names.js
index c3a99b4ec5e04c..1c24ae12b5b22b 100644
--- a/packages/block-editor/src/components/block-list/use-block-props/use-block-class-names.js
+++ b/packages/block-editor/src/components/block-list/use-block-props/use-block-class-names.js
@@ -32,10 +32,12 @@ export function useBlockClassNames( clientId ) {
 				getBlockName,
 				getSettings,
 				hasSelectedInnerBlock,
+				isTyping,
 				__experimentalGetActiveBlockIdByBlockNames: getActiveBlockIdByBlockNames,
 			} = select( blockEditorStore );
 			const {
 				__experimentalSpotlightEntityBlocks: spotlightEntityBlocks,
+				outlineMode,
 			} = getSettings();
 			const isDragging = isBlockBeingDragged( clientId );
 			const isSelected = isBlockSelected( clientId );
@@ -59,6 +61,7 @@ export function useBlockClassNames( clientId ) {
 				'has-active-entity': activeEntityBlockId,
 				// Determine if there is an active entity area to spotlight.
 				'is-active-entity': activeEntityBlockId === clientId,
+				'remove-outline': isSelected && outlineMode && isTyping(),
 			} );
 		},
 		[ clientId ]
diff --git a/packages/block-editor/src/components/block-list/use-in-between-inserter.js b/packages/block-editor/src/components/block-list/use-in-between-inserter.js
index 0dfdab359d7a77..618811ec91ba64 100644
--- a/packages/block-editor/src/components/block-list/use-in-between-inserter.js
+++ b/packages/block-editor/src/components/block-list/use-in-between-inserter.js
@@ -14,12 +14,17 @@ import { InsertionPointOpenRef } from '../block-tools/insertion-point';
 
 export function useInBetweenInserter() {
 	const openRef = useContext( InsertionPointOpenRef );
+	const hasReducedUI = useSelect(
+		( select ) => select( blockEditorStore ).getSettings().hasReducedUI,
+		[]
+	);
 	const {
 		getBlockListSettings,
 		getBlockRootClientId,
 		getBlockIndex,
 		isBlockInsertionPointVisible,
 		isMultiSelecting,
+		getSelectedBlockClientIds,
 	} = useSelect( blockEditorStore );
 	const { showInsertionPoint, hideInsertionPoint } = useDispatch(
 		blockEditorStore
@@ -27,6 +32,10 @@ export function useInBetweenInserter() {
 
 	return useRefEffect(
 		( node ) => {
+			if ( hasReducedUI ) {
+				return;
+			}
+
 			function onMouseMove( event ) {
 				if ( openRef.current ) {
 					return;
@@ -98,6 +107,12 @@ export function useInBetweenInserter() {
 					return;
 				}
 
+				// Don't show the inserter when hovering above (conflicts with
+				// block toolbar) or inside selected block(s).
+				if ( getSelectedBlockClientIds().includes( clientId ) ) {
+					return;
+				}
+
 				const elementRect = element.getBoundingClientRect();
 
 				if (
@@ -145,6 +160,7 @@ export function useInBetweenInserter() {
 			isMultiSelecting,
 			showInsertionPoint,
 			hideInsertionPoint,
+			getSelectedBlockClientIds,
 		]
 	);
 }
diff --git a/packages/block-editor/src/components/block-tools/block-popover.js b/packages/block-editor/src/components/block-tools/block-popover.js
index dc803f7670aba6..8371cfff9bbba8 100644
--- a/packages/block-editor/src/components/block-tools/block-popover.js
+++ b/packages/block-editor/src/components/block-tools/block-popover.js
@@ -64,6 +64,24 @@ function BlockPopover( {
 		hasFixedToolbar,
 		lastClientId,
 	} = useSelect( selector, [] );
+	const isInsertionPointVisible = useSelect(
+		( select ) => {
+			const {
+				isBlockInsertionPointVisible,
+				getBlockInsertionPoint,
+				getBlockOrder,
+			} = select( blockEditorStore );
+
+			if ( ! isBlockInsertionPointVisible() ) {
+				return false;
+			}
+
+			const insertionPoint = getBlockInsertionPoint();
+			const order = getBlockOrder( insertionPoint.rootClientId );
+			return order[ insertionPoint.index ] === clientId;
+		},
+		[ clientId ]
+	);
 	const isLargeViewport = useViewportMatch( 'medium' );
 	const [ isToolbarForced, setIsToolbarForced ] = useState( false );
 	const [ isInserterShown, setIsInserterShown ] = useState( false );
@@ -184,7 +202,9 @@ function BlockPopover( {
 			position={ popoverPosition }
 			focusOnMount={ false }
 			anchorRef={ anchorRef }
-			className="block-editor-block-list__block-popover"
+			className={ classnames( 'block-editor-block-list__block-popover', {
+				'is-insertion-point-visible': isInsertionPointVisible,
+			} ) }
 			__unstableStickyBoundaryElement={ stickyBoundaryElement }
 			// Render in the old slot if needed for backward compatibility,
 			// otherwise render in place (not in the the default popover slot).
diff --git a/packages/block-editor/src/components/block-tools/insertion-point.js b/packages/block-editor/src/components/block-tools/insertion-point.js
index 134430c301a61e..b836beba7d3ae0 100644
--- a/packages/block-editor/src/components/block-tools/insertion-point.js
+++ b/packages/block-editor/src/components/block-tools/insertion-point.js
@@ -36,7 +36,6 @@ function InsertionPointPopover( {
 	const ref = useRef();
 	const {
 		orientation,
-		isHidden,
 		previousClientId,
 		nextClientId,
 		rootClientId,
@@ -45,47 +44,36 @@ function InsertionPointPopover( {
 		const {
 			getBlockOrder,
 			getBlockListSettings,
-			getMultiSelectedBlockClientIds,
-			getSelectedBlockClientId,
-			hasMultiSelection,
-			getSettings,
 			getBlockInsertionPoint,
+			isBlockBeingDragged,
+			getPreviousBlockClientId,
+			getNextBlockClientId,
 		} = select( blockEditorStore );
 		const insertionPoint = getBlockInsertionPoint();
 		const order = getBlockOrder( insertionPoint.rootClientId );
-		const targetClientId = order[ insertionPoint.index - 1 ];
-		const targetRootClientId = insertionPoint.rootClientId;
-		const blockOrder = getBlockOrder( targetRootClientId );
-		if ( ! blockOrder.length ) {
+
+		if ( ! order.length ) {
 			return {};
 		}
-		const previous = targetClientId
-			? targetClientId
-			: blockOrder[ blockOrder.length - 1 ];
-		const isLast = previous === blockOrder[ blockOrder.length - 1 ];
-		const next = isLast
-			? null
-			: blockOrder[ blockOrder.indexOf( previous ) + 1 ];
-		const { hasReducedUI } = getSettings();
-		const multiSelectedBlockClientIds = getMultiSelectedBlockClientIds();
-		const selectedBlockClientId = getSelectedBlockClientId();
-		const blockOrientation =
-			getBlockListSettings( targetRootClientId )?.orientation ||
-			'vertical';
+
+		let _previousClientId = order[ insertionPoint.index - 1 ];
+		let _nextClientId = order[ insertionPoint.index ];
+
+		while ( isBlockBeingDragged( _previousClientId ) ) {
+			_previousClientId = getPreviousBlockClientId( _previousClientId );
+		}
+
+		while ( isBlockBeingDragged( _nextClientId ) ) {
+			_nextClientId = getNextBlockClientId( _nextClientId );
+		}
 
 		return {
-			previousClientId: previous,
-			nextClientId: next,
-			isHidden:
-				hasReducedUI ||
-				( hasMultiSelection()
-					? next && multiSelectedBlockClientIds.includes( next )
-					: next &&
-					  blockOrientation === 'vertical' &&
-					  next === selectedBlockClientId ),
-			orientation: blockOrientation,
-			clientId: targetClientId,
-			rootClientId: targetRootClientId,
+			previousClientId: _previousClientId,
+			nextClientId: _nextClientId,
+			orientation:
+				getBlockListSettings( insertionPoint.rootClientId )
+					?.orientation || 'vertical',
+			rootClientId: insertionPoint.rootClientId,
 			isInserterShown: insertionPoint?.__unstableWithInserter,
 		};
 	}, [] );
@@ -193,14 +181,7 @@ function InsertionPointPopover( {
 	// Only show the inserter when there's a `nextElement` (a block after the
 	// insertion point). At the end of the block list the trailing appender
 	// should serve the purpose of inserting blocks.
-	const showInsertionPointInserter =
-		! isHidden && nextElement && isInserterShown;
-
-	// Show the indicator if the insertion point inserter is visible, or if
-	// the `showInsertionPoint` state is `true`. The latter is generally true
-	// when hovering blocks for insertion in the block library.
-	const showInsertionPointIndicator =
-		showInsertionPointInserter || ! isHidden;
+	const showInsertionPointInserter = nextElement && isInserterShown;
 
 	/* eslint-disable jsx-a11y/no-static-element-interactions, jsx-a11y/click-events-have-key-events */
 	// While ideally it would be enough to capture the
@@ -231,9 +212,7 @@ function InsertionPointPopover( {
 				} ) }
 				style={ style }
 			>
-				{ showInsertionPointIndicator && (
-					<div className="block-editor-block-list__insertion-point-indicator" />
-				) }
+				<div className="block-editor-block-list__insertion-point-indicator" />
 				{ showInsertionPointInserter && (
 					<div
 						className={ classnames(
@@ -266,11 +245,7 @@ export default function InsertionPoint( {
 	__unstableContentRef,
 } ) {
 	const isVisible = useSelect( ( select ) => {
-		const { isMultiSelecting, isBlockInsertionPointVisible } = select(
-			blockEditorStore
-		);
-
-		return isBlockInsertionPointVisible() && ! isMultiSelecting();
+		return select( blockEditorStore ).isBlockInsertionPointVisible();
 	}, [] );
 
 	return (
diff --git a/packages/block-editor/src/components/block-tools/style.scss b/packages/block-editor/src/components/block-tools/style.scss
index e511a41fabe92c..072b085f387bc1 100644
--- a/packages/block-editor/src/components/block-tools/style.scss
+++ b/packages/block-editor/src/components/block-tools/style.scss
@@ -321,6 +321,11 @@
 		}
 	}
 
+	// Hide the block toolbar if the insertion point is shown.
+	&.is-insertion-point-visible {
+		visibility: hidden;
+	}
+
 	.is-dragging-components-draggable & {
 		opacity: 0;
 		// Use a minimal duration to delay hiding the element, see hide-during-dragging animation for more details.
diff --git a/packages/block-editor/src/components/button-block-appender/index.js b/packages/block-editor/src/components/button-block-appender/index.js
index eecd1bf51af174..6fa49f5f614252 100644
--- a/packages/block-editor/src/components/button-block-appender/index.js
+++ b/packages/block-editor/src/components/button-block-appender/index.js
@@ -10,6 +10,7 @@ import { Button, Tooltip, VisuallyHidden } from '@wordpress/components';
 import { forwardRef } from '@wordpress/element';
 import { _x, sprintf } from '@wordpress/i18n';
 import { Icon, plus } from '@wordpress/icons';
+import deprecated from '@wordpress/deprecated';
 
 /**
  * Internal dependencies
@@ -81,6 +82,19 @@ function ButtonBlockAppender(
 	);
 }
 
+/**
+ * Use `ButtonBlockAppender` instead.
+ *
+ * @deprecated
+ */
+export const ButtonBlockerAppender = forwardRef( ( props, ref ) => {
+	deprecated( `wp.blockEditor.ButtonBlockerAppender`, {
+		alternative: 'wp.blockEditor.ButtonBlockAppender',
+	} );
+
+	return ButtonBlockAppender( props, ref );
+} );
+
 /**
  * @see https://github.com/WordPress/gutenberg/blob/HEAD/packages/block-editor/src/components/button-block-appender/README.md
  */
diff --git a/packages/block-editor/src/components/index.js b/packages/block-editor/src/components/index.js
index 51d9ba8c1a0dbe..bf906202779fee 100644
--- a/packages/block-editor/src/components/index.js
+++ b/packages/block-editor/src/components/index.js
@@ -34,7 +34,11 @@ export {
 	BlockVerticalAlignmentControl,
 } from './block-vertical-alignment-control';
 export { default as __experimentalBorderStyleControl } from './border-style-control';
-export { default as ButtonBlockerAppender } from './button-block-appender';
+export {
+	// This is a typo, but kept here for back-compat.
+	ButtonBlockerAppender,
+	default as ButtonBlockAppender,
+} from './button-block-appender';
 export { default as ColorPalette } from './color-palette';
 export { default as ColorPaletteControl } from './color-palette/control';
 export { default as ContrastChecker } from './contrast-checker';
diff --git a/packages/block-editor/src/components/use-block-drop-zone/index.js b/packages/block-editor/src/components/use-block-drop-zone/index.js
index 391f78ac97aa3c..62e13c9b6b0af9 100644
--- a/packages/block-editor/src/components/use-block-drop-zone/index.js
+++ b/packages/block-editor/src/components/use-block-drop-zone/index.js
@@ -59,16 +59,7 @@ export function getNearestBlockIndex( elements, position, orientation ) {
 			// If the user is dropping to the trailing edge of the block
 			// add 1 to the index to represent dragging after.
 			const isTrailingEdge = edge === 'bottom' || edge === 'right';
-			let offset = isTrailingEdge ? 1 : 0;
-
-			// If the target is the dragged block itself and another 1 to
-			// index as the dragged block is set to `display: none` and
-			// should be skipped in the calculation.
-			const isTargetDraggedBlock =
-				isTrailingEdge &&
-				elements[ index + 1 ] &&
-				elements[ index + 1 ].classList.contains( 'is-dragging' );
-			offset += isTargetDraggedBlock ? 1 : 0;
+			const offset = isTrailingEdge ? 1 : 0;
 
 			// Update the currently known best candidate.
 			candidateDistance = distance;
@@ -98,20 +89,15 @@ export default function useBlockDropZone( {
 } = {} ) {
 	const [ targetBlockIndex, setTargetBlockIndex ] = useState( null );
 
-	const { isLockedAll, orientation } = useSelect(
+	const isLockedAll = useSelect(
 		( select ) => {
-			const { getBlockListSettings, getTemplateLock } = select(
-				blockEditorStore
-			);
-			return {
-				isLockedAll: getTemplateLock( targetRootClientId ) === 'all',
-				orientation: getBlockListSettings( targetRootClientId )
-					?.orientation,
-			};
+			const { getTemplateLock } = select( blockEditorStore );
+			return getTemplateLock( targetRootClientId ) === 'all';
 		},
 		[ targetRootClientId ]
 	);
 
+	const { getBlockListSettings } = useSelect( blockEditorStore );
 	const { showInsertionPoint, hideInsertionPoint } = useDispatch(
 		blockEditorStore
 	);
@@ -123,7 +109,7 @@ export default function useBlockDropZone( {
 			const targetIndex = getNearestBlockIndex(
 				blockElements,
 				{ x: event.clientX, y: event.clientY },
-				orientation
+				getBlockListSettings( targetRootClientId )?.orientation
 			);
 
 			setTargetBlockIndex( targetIndex === undefined ? 0 : targetIndex );
@@ -144,6 +130,11 @@ export default function useBlockDropZone( {
 			// https://developer.mozilla.org/en-US/docs/Web/API/Event/currentTarget
 			throttled( event, event.currentTarget );
 		},
+		onDragLeave() {
+			throttled.cancel();
+			hideInsertionPoint();
+			setTargetBlockIndex( null );
+		},
 		onDragEnd() {
 			throttled.cancel();
 			hideInsertionPoint();
diff --git a/packages/block-editor/src/components/use-block-drop-zone/test/index.js b/packages/block-editor/src/components/use-block-drop-zone/test/index.js
index c0aac7b5827d92..42a9476be0cd41 100644
--- a/packages/block-editor/src/components/use-block-drop-zone/test/index.js
+++ b/packages/block-editor/src/components/use-block-drop-zone/test/index.js
@@ -209,27 +209,6 @@ describe( 'getNearestBlockIndex', () => {
 
 			expect( result ).toBe( 4 );
 		} );
-
-		it( 'skips the block being dragged by checking for the `is-dragging` classname', () => {
-			const position = { x: 0, y: 450 };
-
-			const verticalElementsWithDraggedBlock = [
-				...verticalElements.slice( 0, 2 ),
-				{
-					...verticalElements[ 2 ],
-					classList: createMockClassList( 'wp-block is-dragging' ),
-				},
-				...verticalElements.slice( 3, 4 ),
-			];
-
-			const result = getNearestBlockIndex(
-				verticalElementsWithDraggedBlock,
-				position,
-				orientation
-			);
-
-			expect( result ).toBe( 3 );
-		} );
 	} );
 
 	describe( 'Horizontal block lists', () => {
@@ -342,26 +321,5 @@ describe( 'getNearestBlockIndex', () => {
 
 			expect( result ).toBe( 4 );
 		} );
-
-		it( 'skips the block being dragged by checking for the `is-dragging` classname', () => {
-			const position = { x: 450, y: 0 };
-
-			const horizontalElementsWithDraggedBlock = [
-				...horizontalElements.slice( 0, 2 ),
-				{
-					...horizontalElements[ 2 ],
-					classList: createMockClassList( 'wp-block is-dragging' ),
-				},
-				...horizontalElements.slice( 3, 4 ),
-			];
-
-			const result = getNearestBlockIndex(
-				horizontalElementsWithDraggedBlock,
-				position,
-				orientation
-			);
-
-			expect( result ).toBe( 3 );
-		} );
 	} );
 } );
diff --git a/packages/block-editor/src/components/use-setting/index.js b/packages/block-editor/src/components/use-setting/index.js
index 43ee185c396617..d302ceb277425f 100644
--- a/packages/block-editor/src/components/use-setting/index.js
+++ b/packages/block-editor/src/components/use-setting/index.js
@@ -49,18 +49,11 @@ const deprecatedFlags = {
 	'spacing.customPadding': ( settings ) => settings.enableCustomSpacing,
 };
 
-const filterColorsFromCoreOrigin = ( path, setting ) => {
-	if ( path !== 'color.palette' && path !== 'color.gradients' ) {
-		return setting;
-	}
-
-	if ( ! Array.isArray( setting ) ) {
-		return setting;
-	}
-
-	const colors = setting.filter( ( color ) => color?.origin !== 'core' );
-
-	return colors.length > 0 ? colors : setting;
+const PATHS_WITH_MERGE = {
+	'color.gradients': true,
+	'color.palette': true,
+	'typography.fontFamilies': true,
+	'typography.fontSizes': true,
 };
 
 /**
@@ -90,10 +83,14 @@ export default function useSetting( path ) {
 			const experimentalFeaturesResult =
 				get( settings, blockPath ) ?? get( settings, defaultsPath );
 			if ( experimentalFeaturesResult !== undefined ) {
-				return filterColorsFromCoreOrigin(
-					path,
-					experimentalFeaturesResult
-				);
+				if ( PATHS_WITH_MERGE[ path ] ) {
+					return (
+						experimentalFeaturesResult.user ??
+						experimentalFeaturesResult.theme ??
+						experimentalFeaturesResult.core
+					);
+				}
+				return experimentalFeaturesResult;
 			}
 
 			// 2 - Use deprecated settings, otherwise.
@@ -101,10 +98,7 @@ export default function useSetting( path ) {
 				? deprecatedFlags[ path ]( settings )
 				: undefined;
 			if ( deprecatedSettingsValue !== undefined ) {
-				return filterColorsFromCoreOrigin(
-					path,
-					deprecatedSettingsValue
-				);
+				return deprecatedSettingsValue;
 			}
 
 			// 3 - Fall back for typography.dropCap:
diff --git a/packages/block-editor/src/store/actions.js b/packages/block-editor/src/store/actions.js
index 69da6c75860edf..ec1bb964de3c0a 100644
--- a/packages/block-editor/src/store/actions.js
+++ b/packages/block-editor/src/store/actions.js
@@ -277,6 +277,22 @@ export function stopMultiSelect() {
  * @param {string} end   Last block of the multiselection.
  */
 export function* multiSelect( start, end ) {
+	const startBlockRootClientId = yield controls.select(
+		blockEditorStoreName,
+		'getBlockRootClientId',
+		start
+	);
+	const endBlockRootClientId = yield controls.select(
+		blockEditorStoreName,
+		'getBlockRootClientId',
+		end
+	);
+
+	// Only allow block multi-selections at the same level.
+	if ( startBlockRootClientId !== endBlockRootClientId ) {
+		return;
+	}
+
 	yield {
 		type: 'MULTI_SELECT',
 		start,
diff --git a/packages/block-editor/src/store/test/actions.js b/packages/block-editor/src/store/test/actions.js
index 6433f15e6523e7..c651122f77ad72 100644
--- a/packages/block-editor/src/store/test/actions.js
+++ b/packages/block-editor/src/store/test/actions.js
@@ -147,16 +147,60 @@ describe( 'actions', () => {
 		} );
 	} );
 	describe( 'multiSelect', () => {
-		it( 'should return MULTI_SELECT action', () => {
+		it( 'should return MULTI_SELECT action if blocks have the same root client id', () => {
 			const start = 'start';
 			const end = 'end';
-			const fulfillment = multiSelect( start, end );
-			expect( fulfillment.next().value ).toEqual( {
+			const multiSelectGenerator = multiSelect( start, end );
+
+			expect( multiSelectGenerator.next().value ).toEqual(
+				controls.select(
+					blockEditorStoreName,
+					'getBlockRootClientId',
+					start
+				)
+			);
+
+			expect( multiSelectGenerator.next( 'parent' ).value ).toEqual(
+				controls.select(
+					blockEditorStoreName,
+					'getBlockRootClientId',
+					end
+				)
+			);
+
+			expect( multiSelectGenerator.next( 'parent' ).value ).toEqual( {
 				type: 'MULTI_SELECT',
 				start,
 				end,
 			} );
 		} );
+
+		it( 'should return undefined if blocks have different root client ids', () => {
+			const start = 'start';
+			const end = 'end';
+			const multiSelectGenerator = multiSelect( start, end );
+
+			expect( multiSelectGenerator.next().value ).toEqual(
+				controls.select(
+					blockEditorStoreName,
+					'getBlockRootClientId',
+					start
+				)
+			);
+
+			expect( multiSelectGenerator.next( 'parent' ).value ).toEqual(
+				controls.select(
+					blockEditorStoreName,
+					'getBlockRootClientId',
+					end
+				)
+			);
+
+			expect( multiSelectGenerator.next( 'another parent' ) ).toEqual( {
+				done: true,
+				value: undefined,
+			} );
+		} );
 	} );
 
 	describe( 'clearSelectedBlock', () => {
diff --git a/packages/block-library/CHANGELOG.md b/packages/block-library/CHANGELOG.md
index 46b6aa9443a5ee..62ed002f5d028e 100644
--- a/packages/block-library/CHANGELOG.md
+++ b/packages/block-library/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 ## Unreleased
 
+## Breaking Changes
+
+-   Removes the `core/legacy-widget` block. This is now in `@wordpress/widgets`
+	via `registerLegacyWidgetBlock()`.
+
 ## 3.2.0 (2021-05-24)
 
 ### New Features
diff --git a/packages/block-library/src/editor.scss b/packages/block-library/src/editor.scss
index 4118213572e232..49d89ff9e7c3f9 100644
--- a/packages/block-library/src/editor.scss
+++ b/packages/block-library/src/editor.scss
@@ -20,7 +20,6 @@
 @import "./html/editor.scss";
 @import "./image/editor.scss";
 @import "./latest-posts/editor.scss";
-@import "./legacy-widget/editor.scss";
 @import "./media-text/editor.scss";
 @import "./more/editor.scss";
 @import "./navigation/editor.scss";
diff --git a/packages/block-library/src/index.js b/packages/block-library/src/index.js
index 73713305c10308..0716373e244b8b 100644
--- a/packages/block-library/src/index.js
+++ b/packages/block-library/src/index.js
@@ -38,7 +38,6 @@ import * as navigationLink from './navigation-link';
 import * as homeLink from './home-link';
 import * as latestComments from './latest-comments';
 import * as latestPosts from './latest-posts';
-import * as legacyWidget from './legacy-widget';
 import * as logInOut from './loginout';
 import * as list from './list';
 import * as missing from './missing';
@@ -148,7 +147,6 @@ export const __experimentalGetCoreBlocks = () => [
 	mediaText,
 	latestComments,
 	latestPosts,
-	legacyWidget,
 	missing,
 	more,
 	nextpage,
diff --git a/packages/block-library/src/social-links/style.scss b/packages/block-library/src/social-links/style.scss
index eb1d5bc57934c3..eee1000a913f24 100644
--- a/packages/block-library/src/social-links/style.scss
+++ b/packages/block-library/src/social-links/style.scss
@@ -69,7 +69,7 @@
 	}
 }
 
-.wp-social-link {
+.wp-block-social-link {
 	display: block;
 	border-radius: 9999px; // This makes it pill-shaped instead of oval, in cases where the image fed is not perfectly sized.
 	transition: transform 0.1s ease;
@@ -84,20 +84,22 @@
 		transition: transform 0.1s ease;
 	}
 
-	a,
-	a:hover,
-	a:active,
-	a:visited,
-	svg {
-		color: currentColor;
-		fill: currentColor;
-	}
-
 	&:hover {
 		transform: scale(1.1);
 	}
 }
 
+// This needs specificity because themes usually override it with things like .widget-area a.
+.wp-block-social-links .wp-block-social-link .wp-block-social-link-anchor {
+	&,
+	&:hover,
+	&:active,
+	&:visited,
+	svg {
+		color: currentColor;
+		fill: currentColor;
+	}
+}
 
 // Provide colors for a range of icons.
 .wp-block-social-links:not(.is-style-logos-only) {
diff --git a/packages/compose/src/hooks/use-drop-zone/index.js b/packages/compose/src/hooks/use-drop-zone/index.js
index bbfc0ba461a89c..f2af24c549bf6a 100644
--- a/packages/compose/src/hooks/use-drop-zone/index.js
+++ b/packages/compose/src/hooks/use-drop-zone/index.js
@@ -56,7 +56,31 @@ export default function useDropZone( {
 
 			const { ownerDocument } = element;
 
-			function maybeDragStart( event ) {
+			/**
+			 * Checks if an element is in the drop zone.
+			 *
+			 * @param {HTMLElement|null} elementToCheck
+			 *
+			 * @return {boolean} True if in drop zone, false if not.
+			 */
+			function isElementInZone( elementToCheck ) {
+				if (
+					! elementToCheck ||
+					! element.contains( elementToCheck )
+				) {
+					return false;
+				}
+
+				do {
+					if ( elementToCheck.dataset.isDropZone ) {
+						return elementToCheck === element;
+					}
+				} while ( ( elementToCheck = elementToCheck.parentElement ) );
+
+				return false;
+			}
+
+			function maybeDragStart( /** @type {DragEvent} */ event ) {
 				if ( isDragging ) {
 					return;
 				}
@@ -68,6 +92,13 @@ export default function useDropZone( {
 					maybeDragStart
 				);
 
+				// Note that `dragend` doesn't fire consistently for file and
+				// HTML drag events where the drag origin is outside the browser
+				// window. In Firefox it may also not fire if the originating
+				// node is removed.
+				ownerDocument.addEventListener( 'dragend', maybeDragEnd );
+				ownerDocument.addEventListener( 'mousemove', maybeDragEnd );
+
 				if ( onDragStartRef.current ) {
 					onDragStartRef.current( event );
 				}
@@ -106,7 +137,7 @@ export default function useDropZone( {
 				// leaving the drop zone, which means the `relatedTarget`
 				// (element that has been entered) should be outside the drop
 				// zone.
-				if ( element.contains( event.relatedTarget ) ) {
+				if ( isElementInZone( event.relatedTarget ) ) {
 					return;
 				}
 
@@ -146,33 +177,31 @@ export default function useDropZone( {
 				isDragging = false;
 
 				ownerDocument.addEventListener( 'dragenter', maybeDragStart );
+				ownerDocument.removeEventListener( 'dragend', maybeDragEnd );
+				ownerDocument.removeEventListener( 'mousemove', maybeDragEnd );
 
 				if ( onDragEndRef.current ) {
 					onDragEndRef.current( event );
 				}
 			}
 
+			element.dataset.isDropZone = 'true';
 			element.addEventListener( 'drop', onDrop );
 			element.addEventListener( 'dragenter', onDragEnter );
 			element.addEventListener( 'dragover', onDragOver );
 			element.addEventListener( 'dragleave', onDragLeave );
-			// Note that `dragend` doesn't fire consistently for file and HTML
-			// drag  events where the drag origin is outside the browser window.
-			// In Firefox it may also not fire if the originating node is
-			// removed.
-			ownerDocument.addEventListener( 'dragend', maybeDragEnd );
-			ownerDocument.addEventListener( 'mouseup', maybeDragEnd );
 			// The `dragstart` event doesn't fire if the drag started outside
 			// the document.
 			ownerDocument.addEventListener( 'dragenter', maybeDragStart );
 
 			return () => {
+				delete element.dataset.isDropZone;
 				element.removeEventListener( 'drop', onDrop );
 				element.removeEventListener( 'dragenter', onDragEnter );
 				element.removeEventListener( 'dragover', onDragOver );
 				element.removeEventListener( 'dragleave', onDragLeave );
 				ownerDocument.removeEventListener( 'dragend', maybeDragEnd );
-				ownerDocument.removeEventListener( 'mouseup', maybeDragEnd );
+				ownerDocument.removeEventListener( 'mousemove', maybeDragEnd );
 				ownerDocument.addEventListener( 'dragenter', maybeDragStart );
 			};
 		},
diff --git a/packages/customize-widgets/src/components/sidebar-block-editor/index.js b/packages/customize-widgets/src/components/sidebar-block-editor/index.js
index 8ba9182a9209dd..40592021000aff 100644
--- a/packages/customize-widgets/src/components/sidebar-block-editor/index.js
+++ b/packages/customize-widgets/src/components/sidebar-block-editor/index.js
@@ -18,6 +18,7 @@ import {
 	WritingFlow,
 	BlockEditorKeyboardShortcuts,
 	__unstableBlockSettingsMenuFirstItem,
+	ButtonBlockAppender,
 } from '@wordpress/block-editor';
 import { uploadMedia } from '@wordpress/media-utils';
 
@@ -116,7 +117,9 @@ export default function SidebarBlockEditor( {
 					<BlockSelectionClearer>
 						<WritingFlow>
 							<ObserveTyping>
-								<BlockList />
+								<BlockList
+									renderAppender={ ButtonBlockAppender }
+								/>
 							</ObserveTyping>
 						</WritingFlow>
 					</BlockSelectionClearer>
diff --git a/packages/customize-widgets/src/index.js b/packages/customize-widgets/src/index.js
index 1b2d02b3c81fd9..3a725ccdda2ba6 100644
--- a/packages/customize-widgets/src/index.js
+++ b/packages/customize-widgets/src/index.js
@@ -7,7 +7,10 @@ import {
 	__experimentalGetCoreBlocks,
 	__experimentalRegisterExperimentalCoreBlocks,
 } from '@wordpress/block-library';
-import { registerLegacyWidgetVariations } from '@wordpress/widgets';
+import {
+	registerLegacyWidgetBlock,
+	registerLegacyWidgetVariations,
+} from '@wordpress/widgets';
 
 /**
  * Internal dependencies
@@ -30,11 +33,10 @@ export function initialize( editorName, blockEditorSettings ) {
 		( block ) => ! [ 'core/more' ].includes( block.name )
 	);
 	registerCoreBlocks( coreBlocks );
-
+	registerLegacyWidgetBlock();
 	if ( process.env.GUTENBERG_PHASE === 2 ) {
 		__experimentalRegisterExperimentalCoreBlocks();
 	}
-
 	registerLegacyWidgetVariations( blockEditorSettings );
 
 	const SidebarControl = getSidebarControl( blockEditorSettings );
diff --git a/packages/data/src/components/use-select/index.js b/packages/data/src/components/use-select/index.js
index b9249c671f328c..b0246aaf09f849 100644
--- a/packages/data/src/components/use-select/index.js
+++ b/packages/data/src/components/use-select/index.js
@@ -148,12 +148,11 @@ export default function useSelect( _mapSelect, deps ) {
 				errorMessage += `\nThe error may be correlated with this previous error:\n`;
 				errorMessage += `${ latestMapOutputError.current.stack }\n\n`;
 				errorMessage += 'Original stack trace:';
-
-				throw new Error( errorMessage );
-			} else {
-				// eslint-disable-next-line no-console
-				console.error( errorMessage );
 			}
+
+			// eslint-disable-next-line no-console
+			console.error( errorMessage );
+			mapOutput = latestMapOutput.current;
 		}
 	}
 
diff --git a/packages/e2e-tests/fixtures/blocks/core__legacy-widget.html b/packages/e2e-tests/fixtures/blocks/core__legacy-widget.html
deleted file mode 100644
index 293a884c37414f..00000000000000
--- a/packages/e2e-tests/fixtures/blocks/core__legacy-widget.html
+++ /dev/null
@@ -1 +0,0 @@
-<!-- wp:legacy-widget {"idBase":"search","instance":{"encoded":"YTowOnt9","hash":"b9b82f721929717273108125217fbcd9","raw":{}}} /-->
diff --git a/packages/e2e-tests/fixtures/blocks/core__legacy-widget.json b/packages/e2e-tests/fixtures/blocks/core__legacy-widget.json
deleted file mode 100644
index fc919a1597d6ca..00000000000000
--- a/packages/e2e-tests/fixtures/blocks/core__legacy-widget.json
+++ /dev/null
@@ -1,18 +0,0 @@
-[
-	{
-		"clientId": "_clientId_0",
-		"name": "core/legacy-widget",
-		"isValid": true,
-		"attributes": {
-			"id": null,
-			"idBase": "search",
-			"instance": {
-				"encoded": "YTowOnt9",
-				"hash": "b9b82f721929717273108125217fbcd9",
-				"raw": {}
-			}
-		},
-		"innerBlocks": [],
-		"originalContent": ""
-	}
-]
diff --git a/packages/e2e-tests/fixtures/blocks/core__legacy-widget.parsed.json b/packages/e2e-tests/fixtures/blocks/core__legacy-widget.parsed.json
deleted file mode 100644
index e97d26c0f43b22..00000000000000
--- a/packages/e2e-tests/fixtures/blocks/core__legacy-widget.parsed.json
+++ /dev/null
@@ -1,16 +0,0 @@
-[
-	{
-		"blockName": "core/legacy-widget",
-		"attrs": {
-			"idBase": "search",
-			"instance": {
-				"encoded": "YTowOnt9",
-				"hash": "b9b82f721929717273108125217fbcd9",
-				"raw": {}
-			}
-		},
-		"innerBlocks": [],
-		"innerHTML": "",
-		"innerContent": []
-	}
-]
diff --git a/packages/e2e-tests/fixtures/blocks/core__legacy-widget.serialized.html b/packages/e2e-tests/fixtures/blocks/core__legacy-widget.serialized.html
deleted file mode 100644
index 293a884c37414f..00000000000000
--- a/packages/e2e-tests/fixtures/blocks/core__legacy-widget.serialized.html
+++ /dev/null
@@ -1 +0,0 @@
-<!-- wp:legacy-widget {"idBase":"search","instance":{"encoded":"YTowOnt9","hash":"b9b82f721929717273108125217fbcd9","raw":{}}} /-->
diff --git a/packages/e2e-tests/specs/editor/plugins/__snapshots__/wp-editor-meta-box.test.js.snap b/packages/e2e-tests/specs/editor/plugins/__snapshots__/wp-editor-meta-box.test.js.snap
index 485862873b648d..29a3d82f5f0685 100644
--- a/packages/e2e-tests/specs/editor/plugins/__snapshots__/wp-editor-meta-box.test.js.snap
+++ b/packages/e2e-tests/specs/editor/plugins/__snapshots__/wp-editor-meta-box.test.js.snap
@@ -1,3 +1,3 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`WP Editor Meta Boxes Should save the changes 1`] = `"<p>Typing in a metabox</p>"`;
+exports[`WP Editor Meta Boxes Should save the changes 1`] = `"Typing in a metabox"`;
diff --git a/packages/e2e-tests/specs/editor/various/multi-block-selection.test.js b/packages/e2e-tests/specs/editor/various/multi-block-selection.test.js
index eba80dd658a89b..f8d748eaa285ca 100644
--- a/packages/e2e-tests/specs/editor/various/multi-block-selection.test.js
+++ b/packages/e2e-tests/specs/editor/various/multi-block-selection.test.js
@@ -9,6 +9,7 @@ import {
 	getEditedPostContent,
 	clickBlockToolbarButton,
 	clickButton,
+	clickMenuItem,
 } from '@wordpress/e2e-test-utils';
 
 async function getSelectedFlatIndices() {
@@ -272,6 +273,19 @@ describe( 'Multi-block selection', () => {
 
 		await testNativeSelection();
 		expect( await getSelectedFlatIndices() ).toEqual( [ 1, 2 ] );
+
+		// Group the blocks and test that multiselection also works for nested
+		// blocks. Checks for regressions of
+		// https://github.com/WordPress/gutenberg/issues/32056
+
+		await clickBlockToolbarButton( 'Options' );
+		await clickMenuItem( 'Group' );
+		await page.click( '[data-type="core/paragraph"]' );
+		await page.keyboard.down( 'Shift' );
+		await page.click( '[data-type="core/paragraph"]:nth-child(2)' );
+		await page.keyboard.up( 'Shift' );
+		await testNativeSelection();
+		expect( await getSelectedFlatIndices() ).toEqual( [ 2, 3 ] );
 	} );
 
 	it( 'should select by dragging', async () => {
diff --git a/packages/e2e-tests/specs/widgets/editing-widgets.test.js b/packages/e2e-tests/specs/widgets/editing-widgets.test.js
index 4c0088d4ea4f2f..4471506c317a6f 100644
--- a/packages/e2e-tests/specs/widgets/editing-widgets.test.js
+++ b/packages/e2e-tests/specs/widgets/editing-widgets.test.js
@@ -9,6 +9,7 @@ import {
 	showBlockToolbar,
 	visitAdminPage,
 	deleteAllWidgets,
+	pressKeyWithModifier,
 } from '@wordpress/e2e-test-utils';
 
 /**
@@ -122,14 +123,17 @@ describe( 'Widgets screen', () => {
 		).toBe( true );
 	}
 
-	async function getInlineInserterButton() {
-		return await find( {
-			role: 'combobox',
-			name: 'Add block',
+	it( 'Should insert content using the global inserter', async () => {
+		const updateButton = await find( {
+			role: 'button',
+			name: 'Update',
 		} );
-	}
 
-	it( 'Should insert content using the global inserter', async () => {
+		// Update button should start out disabled.
+		expect(
+			await updateButton.evaluate( ( button ) => button.disabled )
+		).toBe( true );
+
 		const widgetAreas = await findAll( {
 			role: 'group',
 			name: 'Block: Widget Area',
@@ -146,6 +150,11 @@ describe( 'Widgets screen', () => {
 
 		await addParagraphBlock.click();
 
+		// Adding content should enable the Update button.
+		expect(
+			await updateButton.evaluate( ( button ) => button.disabled )
+		).toBe( false );
+
 		let addedParagraphBlockInFirstWidgetArea = await find(
 			{
 				name: /^Empty block/,
@@ -215,6 +224,12 @@ describe( 'Widgets screen', () => {
 		// await page.keyboard.type( 'Third Paragraph' );
 
 		await saveWidgets();
+
+		// The Update button should be disabled again after saving.
+		expect(
+			await updateButton.evaluate( ( button ) => button.disabled )
+		).toBe( true );
+
 		const serializedWidgetAreas = await getSerializedWidgetAreas();
 		expect( serializedWidgetAreas ).toMatchInlineSnapshot( `
 		Object {
@@ -252,7 +267,10 @@ describe( 'Widgets screen', () => {
 				10
 		);
 
-		let inlineInserterButton = await getInlineInserterButton();
+		let inlineInserterButton = await find( {
+			role: 'combobox',
+			name: 'Add block',
+		} );
 		await inlineInserterButton.click();
 
 		let inlineQuickInserter = await find( {
@@ -312,7 +330,13 @@ describe( 'Widgets screen', () => {
 			secondParagraphBlockBoundingBox.y - 10
 		);
 
-		inlineInserterButton = await getInlineInserterButton();
+		// There will be 2 matches here.
+		// One is the in-between inserter,
+		// and the other one is the button block appender.
+		[ inlineInserterButton ] = await findAll( {
+			role: 'combobox',
+			name: 'Add block',
+		} );
 		await inlineInserterButton.click();
 
 		// TODO: Convert to find() API from puppeteer-testing-library.
@@ -673,6 +697,62 @@ describe( 'Widgets screen', () => {
 		}
 	` );
 	} );
+
+	it( 'Allows widget deletion to be undone', async () => {
+		const [ firstWidgetArea ] = await findAll( {
+			role: 'group',
+			name: 'Block: Widget Area',
+		} );
+
+		let addParagraphBlock = await getBlockInGlobalInserter( 'Paragraph' );
+		await addParagraphBlock.click();
+
+		let addedParagraphBlockInFirstWidgetArea = await find(
+			{
+				name: /^Empty block/,
+				selector: '[data-block][data-type="core/paragraph"]',
+			},
+			{
+				root: firstWidgetArea,
+			}
+		);
+		await addedParagraphBlockInFirstWidgetArea.focus();
+		await page.keyboard.type( 'First Paragraph' );
+
+		addParagraphBlock = await getBlockInGlobalInserter( 'Paragraph' );
+		await addParagraphBlock.click();
+
+		addedParagraphBlockInFirstWidgetArea = await firstWidgetArea.$(
+			'[data-block][data-type="core/paragraph"][aria-label^="Empty block"]'
+		);
+		await addedParagraphBlockInFirstWidgetArea.focus();
+		await page.keyboard.type( 'Second Paragraph' );
+
+		await saveWidgets();
+
+		// Delete the last block and save again.
+		await pressKeyWithModifier( 'access', 'z' );
+		await saveWidgets();
+
+		// Undo block deletion and save again
+		await pressKeyWithModifier( 'primary', 'z' );
+		await saveWidgets();
+
+		// Reload the page to make sure changes were actually saved.
+		await page.reload();
+
+		const serializedWidgetAreas = await getSerializedWidgetAreas();
+		expect( serializedWidgetAreas ).toMatchInlineSnapshot( `
+		Object {
+		  "sidebar-1": "<div class=\\"widget widget_block widget_text\\"><div class=\\"widget-content\\">
+		<p>First Paragraph</p>
+		</div></div>
+		<div class=\\"widget widget_block widget_text\\"><div class=\\"widget-content\\">
+		<p>Second Paragraph</p>
+		</div></div>",
+		}
+	` );
+	} );
 } );
 
 /**
diff --git a/packages/edit-post/src/components/sidebar/template/actions.js b/packages/edit-post/src/components/sidebar/template/actions.js
index b7a0ccec82e7b1..968ead9b810012 100644
--- a/packages/edit-post/src/components/sidebar/template/actions.js
+++ b/packages/edit-post/src/components/sidebar/template/actions.js
@@ -67,7 +67,7 @@ function PostTemplateActions() {
 			</div>
 			{ isModalOpen && (
 				<Modal
-					title={ __( 'Create a custom template' ) }
+					title={ __( 'Create custom template' ) }
 					closeLabel={ __( 'Close' ) }
 					onRequestClose={ () => {
 						setIsModalOpen( false );
@@ -98,18 +98,27 @@ function PostTemplateActions() {
 							setIsModalOpen( false );
 						} }
 					>
-						<TextControl
-							label={ __( 'Name' ) }
-							value={ title }
-							onChange={ setTitle }
-						/>
+						<Flex align="flex-start" gap={ 8 }>
+							<FlexItem>
+								<TextControl
+									label={ __( 'Name' ) }
+									value={ title }
+									onChange={ setTitle }
+									help={ __(
+										'Describe the purpose of the template, e.g. "Full Width". Custom templates can be applied to any post or page.'
+									) }
+								/>
+							</FlexItem>
+						</Flex>
+
 						<Flex
-							className="edit-post-post-template__modal-actions"
+							className="edit-post-template__modal-actions"
 							justify="flex-end"
+							expanded={ false }
 						>
 							<FlexItem>
 								<Button
-									isSecondary
+									isTertiary
 									onClick={ () => {
 										setIsModalOpen( false );
 										setTitle( '' );
diff --git a/packages/edit-post/src/components/sidebar/template/style.scss b/packages/edit-post/src/components/sidebar/template/style.scss
index 0d881ec964a867..0a10546b96f46b 100644
--- a/packages/edit-post/src/components/sidebar/template/style.scss
+++ b/packages/edit-post/src/components/sidebar/template/style.scss
@@ -1,5 +1,31 @@
+.edit-post-template__modal {
+	.components-base-control {
+		@include break-medium() {
+			width: $grid-unit * 40;
+		}
+	}
+
+	.components-modal__header {
+		border-bottom: none;
+	}
+
+	.components-modal__content::before {
+		margin-bottom: $grid-unit-05;
+	}
+}
+
 .edit-post-template__modal-actions {
-	padding-top: $grid-unit-15;
+	margin-top: $grid-unit-15;
+}
+
+.edit-post-template-modal__tip {
+	padding: $grid-unit-20 $grid-unit-30;
+	background: $gray-100;
+	border-radius: $radius-block-ui;
+
+	@include break-medium() {
+		width: $grid-unit * 30;
+	}
 }
 
 .edit-post-template__actions {
diff --git a/packages/edit-post/src/components/visual-editor/index.js b/packages/edit-post/src/components/visual-editor/index.js
index 9164bdfd2c9549..f4b89f28679179 100644
--- a/packages/edit-post/src/components/visual-editor/index.js
+++ b/packages/edit-post/src/components/visual-editor/index.js
@@ -119,7 +119,7 @@ export default function VisualEditor( { styles } ) {
 	const { clearSelectedBlock } = useDispatch( blockEditorStore );
 	const { setIsEditingTemplate } = useDispatch( editPostStore );
 	const desktopCanvasStyles = {
-		height: '100%',
+		minHeight: '100%',
 		width: '100%',
 		margin: 0,
 		display: 'flex',
diff --git a/packages/edit-post/src/components/visual-editor/style.scss b/packages/edit-post/src/components/visual-editor/style.scss
index 9631ae92f5597b..207388691d25d7 100644
--- a/packages/edit-post/src/components/visual-editor/style.scss
+++ b/packages/edit-post/src/components/visual-editor/style.scss
@@ -61,6 +61,9 @@
 
 .edit-post-visual-editor__content-area {
 	width: 100%;
-	height: 100%;
+	// If this is set to height: 100%; it breaks in Safari 13, which calculates the height relatively to the incorrect flex container.
+	// By setting it as a min-height instead, it appears to work in all cases.
+	min-height: 100%;
 	position: relative;
+	display: flex;
 }
diff --git a/packages/edit-site/src/components/editor/global-styles-provider.js b/packages/edit-site/src/components/editor/global-styles-provider.js
index 6d173773a18499..05e672dfa05f17 100644
--- a/packages/edit-site/src/components/editor/global-styles-provider.js
+++ b/packages/edit-site/src/components/editor/global-styles-provider.js
@@ -1,7 +1,7 @@
 /**
  * External dependencies
  */
-import { set, get, mergeWith } from 'lodash';
+import { set, get, mergeWith, mapValues, setWith, clone } from 'lodash';
 
 /**
  * WordPress dependencies
@@ -30,6 +30,7 @@ import {
 	ROOT_BLOCK_SUPPORTS,
 	getValueFromVariable,
 	getPresetVariable,
+	PRESET_METADATA,
 } from './utils';
 import { toCustomProperties, toStyles } from './global-styles-renderer';
 import { store as editSiteStore } from '../../store';
@@ -47,31 +48,7 @@ const GlobalStylesContext = createContext( {
 	/* eslint-enable no-unused-vars */
 } );
 
-const mergeTreesCustomizer = ( objValue, srcValue, key ) => {
-	// Users can add their own colors.
-	// We want to append them when they don't
-	// have the same slug as an existing color,
-	// otherwise we want to update the existing color instead.
-	if ( 'palette' === key ) {
-		const indexTable = {};
-		const existingSlugs = [];
-		const result = [ ...( objValue ?? [] ) ];
-		result.forEach( ( { slug }, index ) => {
-			indexTable[ slug ] = index;
-			existingSlugs.push( slug );
-		} );
-
-		( srcValue ?? [] ).forEach( ( element ) => {
-			if ( existingSlugs.includes( element?.slug ) ) {
-				result[ indexTable[ element?.slug ] ] = element;
-			} else {
-				result.push( element );
-			}
-		} );
-
-		return result;
-	}
-
+const mergeTreesCustomizer = ( objValue, srcValue ) => {
 	// We only pass as arrays the presets,
 	// in which case we want the new array of values
 	// to override the old array (no merging).
@@ -135,6 +112,10 @@ const getBlockMetadata = ( blockTypes ) => {
 	return result;
 };
 
+function immutableSet( object, path, value ) {
+	return setWith( object ? clone( object ) : {}, path, value, clone );
+}
+
 export default function GlobalStylesProvider( { children, baseStyles } ) {
 	const [ content, setContent ] = useGlobalStylesEntityContent();
 	const { blockTypes, settings } = useSelect( ( select ) => {
@@ -174,12 +155,41 @@ export default function GlobalStylesProvider( { children, baseStyles } ) {
 			newUserStyles = EMPTY_CONTENT;
 		}
 
+		const addUserToSettings = ( settingsToAdd ) => {
+			PRESET_METADATA.forEach( ( { path } ) => {
+				const presetData = get( settingsToAdd, path );
+				if ( presetData ) {
+					settingsToAdd = immutableSet( settingsToAdd, path, {
+						user: presetData,
+					} );
+				}
+			} );
+			return settingsToAdd;
+		};
+
+		let userStylesWithOrigin = newUserStyles;
+		if ( userStylesWithOrigin.settings ) {
+			userStylesWithOrigin = {
+				...userStylesWithOrigin,
+				settings: addUserToSettings( userStylesWithOrigin.settings ),
+			};
+			if ( userStylesWithOrigin.settings.blocks ) {
+				userStylesWithOrigin.settings = {
+					...userStylesWithOrigin.settings,
+					blocks: mapValues(
+						userStylesWithOrigin.settings.blocks,
+						addUserToSettings
+					),
+				};
+			}
+		}
+
 		// At this point, the version schema of the theme & user
 		// is the same, so we can merge them.
 		const newMergedStyles = mergeWith(
 			{},
 			baseStyles,
-			newUserStyles,
+			userStylesWithOrigin,
 			mergeTreesCustomizer
 		);
 
diff --git a/packages/edit-site/src/components/editor/global-styles-renderer.js b/packages/edit-site/src/components/editor/global-styles-renderer.js
index 45241512c0e7dc..5d3f9da5cc079b 100644
--- a/packages/edit-site/src/components/editor/global-styles-renderer.js
+++ b/packages/edit-site/src/components/editor/global-styles-renderer.js
@@ -52,12 +52,17 @@ function getPresetsDeclarations( blockPresets = {} ) {
 	return reduce(
 		PRESET_METADATA,
 		( declarations, { path, valueKey, cssVarInfix } ) => {
-			const preset = get( blockPresets, path, [] );
-			preset.forEach( ( value ) => {
-				declarations.push(
-					`--wp--preset--${ cssVarInfix }--${ value.slug }: ${ value[ valueKey ] }`
-				);
+			const presetByOrigin = get( blockPresets, path, [] );
+			[ 'core', 'theme', 'user' ].forEach( ( origin ) => {
+				if ( presetByOrigin[ origin ] ) {
+					presetByOrigin[ origin ].forEach( ( value ) => {
+						declarations.push(
+							`--wp--preset--${ cssVarInfix }--${ value.slug }: ${ value[ valueKey ] }`
+						);
+					} );
+				}
 			} );
+
 			return declarations;
 		},
 		[]
@@ -78,22 +83,26 @@ function getPresetsClasses( blockSelector, blockPresets = {} ) {
 			if ( ! classes ) {
 				return declarations;
 			}
-			const presets = get( blockPresets, path, [] );
-			presets.forEach( ( preset ) => {
-				classes.forEach( ( { classSuffix, propertyName } ) => {
-					const slug = preset.slug;
-					const value = preset[ valueKey ];
-					// We don't want to use kebabCase from lodash here
-					// see https://github.com/WordPress/gutenberg/issues/32347
-					// However, we need to make sure the generated class
-					// doesn't contain spaces.
-					const classSelectorToUse = `.has-${ slug.replace(
-						/\s+/g,
-						'-'
-					) }-${ classSuffix }`;
-					const selectorToUse = `${ blockSelector }${ classSelectorToUse }`;
-					declarations += `${ selectorToUse }{${ propertyName }: ${ value } !important;}`;
-				} );
+			const presetByOrigin = get( blockPresets, path, [] );
+			[ 'core', 'theme', 'user' ].forEach( ( origin ) => {
+				if ( presetByOrigin[ origin ] ) {
+					presetByOrigin[ origin ].forEach( ( preset ) => {
+						classes.forEach( ( { classSuffix, propertyName } ) => {
+							const slug = preset.slug;
+							const value = preset[ valueKey ];
+							// We don't want to use kebabCase from lodash here
+							// see https://github.com/WordPress/gutenberg/issues/32347
+							// However, we need to make sure the generated class
+							// doesn't contain spaces.
+							const classSelectorToUse = `.has-${ slug.replace(
+								/\s+/g,
+								'-'
+							) }-${ classSuffix }`;
+							const selectorToUse = `${ blockSelector }${ classSelectorToUse }`;
+							declarations += `${ selectorToUse }{${ propertyName }: ${ value } !important;}`;
+						} );
+					} );
+				}
 			} );
 			return declarations;
 		},
diff --git a/packages/edit-site/src/components/editor/test/global-styles-renderer.js b/packages/edit-site/src/components/editor/test/global-styles-renderer.js
index 9d0f510c4be592..37798630dcd8e1 100644
--- a/packages/edit-site/src/components/editor/test/global-styles-renderer.js
+++ b/packages/edit-site/src/components/editor/test/global-styles-renderer.js
@@ -214,10 +214,20 @@ describe( 'global styles renderer', () => {
 			const tree = {
 				settings: {
 					color: {
-						palette: [
-							{ name: 'White', slug: 'white', color: 'white' },
-							{ name: 'Black', slug: 'black', color: 'black' },
-						],
+						palette: {
+							user: [
+								{
+									name: 'White',
+									slug: 'white',
+									color: 'white',
+								},
+								{
+									name: 'Black',
+									slug: 'black',
+									color: 'black',
+								},
+							],
+						},
 					},
 					custom: {
 						'font-primary': 'value',
@@ -229,18 +239,20 @@ describe( 'global styles renderer', () => {
 					blocks: {
 						'core/heading': {
 							typography: {
-								fontSizes: [
-									{
-										name: 'small',
-										slug: 'small',
-										size: '12px',
-									},
-									{
-										name: 'medium',
-										slug: 'medium',
-										size: '23px',
-									},
-								],
+								fontSizes: {
+									theme: [
+										{
+											name: 'small',
+											slug: 'small',
+											size: '12px',
+										},
+										{
+											name: 'medium',
+											slug: 'medium',
+											size: '23px',
+										},
+									],
+								},
 							},
 						},
 					},
@@ -264,10 +276,20 @@ describe( 'global styles renderer', () => {
 			const tree = {
 				settings: {
 					color: {
-						palette: [
-							{ name: 'White', slug: 'white', color: 'white' },
-							{ name: 'Black', slug: 'black', color: 'black' },
-						],
+						palette: {
+							core: [
+								{
+									name: 'White',
+									slug: 'white',
+									color: 'white',
+								},
+								{
+									name: 'Black',
+									slug: 'black',
+									color: 'black',
+								},
+							],
+						},
 					},
 				},
 				styles: {
diff --git a/packages/edit-site/src/components/editor/utils.js b/packages/edit-site/src/components/editor/utils.js
index 7d5d55884feeeb..05218ea42ad108 100644
--- a/packages/edit-site/src/components/editor/utils.js
+++ b/packages/edit-site/src/components/editor/utils.js
@@ -90,18 +90,11 @@ function getPresetMetadataFromStyleProperty( styleProperty ) {
 	return getPresetMetadataFromStyleProperty.MAP[ styleProperty ];
 }
 
-const filterColorsFromCoreOrigin = ( path, setting ) => {
-	if ( path !== 'color.palette' && path !== 'color.gradients' ) {
-		return setting;
-	}
-
-	if ( ! Array.isArray( setting ) ) {
-		return setting;
-	}
-
-	const colors = setting.filter( ( color ) => color?.origin !== 'core' );
-
-	return colors.length > 0 ? colors : setting;
+const PATHS_WITH_MERGE = {
+	'color.gradients': true,
+	'color.palette': true,
+	'typography.fontFamilies': true,
+	'typography.fontSizes': true,
 };
 
 export function useSetting( path, blockName = '' ) {
@@ -110,8 +103,11 @@ export function useSetting( path, blockName = '' ) {
 	} );
 	const topLevelPath = `__experimentalFeatures.${ path }`;
 	const blockPath = `__experimentalFeatures.blocks.${ blockName }.${ path }`;
-	const setting = get( settings, blockPath ) ?? get( settings, topLevelPath );
-	return filterColorsFromCoreOrigin( path, setting );
+	const result = get( settings, blockPath ) ?? get( settings, topLevelPath );
+	if ( PATHS_WITH_MERGE[ path ] ) {
+		return result.user ?? result.theme ?? result.core;
+	}
+	return result;
 }
 
 export function getPresetVariable( styles, context, propertyName, value ) {
diff --git a/packages/edit-site/src/components/sidebar/color-palette-panel.js b/packages/edit-site/src/components/sidebar/color-palette-panel.js
index 49e7c964fc29c8..fbae0697b9c811 100644
--- a/packages/edit-site/src/components/sidebar/color-palette-panel.js
+++ b/packages/edit-site/src/components/sidebar/color-palette-panel.js
@@ -1,7 +1,7 @@
 /**
  * External dependencies
  */
-import { difference, get } from 'lodash';
+import { get } from 'lodash';
 
 /**
  * WordPress dependencies
@@ -38,14 +38,23 @@ export default function ColorPalettePanel( {
 		( select ) => {
 			const baseStyles = select( editSiteStore ).getSettings()
 				.__experimentalGlobalStylesBaseStyles;
+			const contextualBasePalette = get( baseStyles, [
+				'settings',
+				'blocks',
+				contextName,
+				'color',
+				'palette',
+			] );
+			const globalPalette = get( baseStyles, [
+				'settings',
+				'color',
+				'palette',
+			] );
 			const basePalette =
-				get( baseStyles, [
-					'settings',
-					'blocks',
-					contextName,
-					'color',
-					'palette',
-				] ) ?? get( baseStyles, [ 'settings', 'color', 'palette' ] );
+				contextualBasePalette?.theme ??
+				contextualBasePalette?.core ??
+				globalPalette?.theme ??
+				globalPalette?.core;
 			if ( ! basePalette ) {
 				return EMPTY_ARRAY;
 			}
@@ -58,21 +67,7 @@ export default function ColorPalettePanel( {
 			immutableColorSlugs={ immutableColorSlugs }
 			colors={ colors }
 			onChange={ ( newColors ) => {
-				const existingUserColors = ( newColors ?? [] ).filter(
-					( color ) => color.origin === 'user'
-				);
-				const differentUserColors = difference( newColors, colors );
-				if ( differentUserColors.length === 1 ) {
-					differentUserColors[ 0 ] = {
-						...differentUserColors[ 0 ],
-						origin: 'user',
-					};
-				}
-
-				setSetting( contextName, 'color.palette', [
-					...existingUserColors,
-					...differentUserColors,
-				] );
+				setSetting( contextName, 'color.palette', newColors );
 			} }
 			emptyUI={ __(
 				'Colors are empty! Add some colors to create your own color palette.'
diff --git a/packages/edit-widgets/src/blocks/widget-area/edit/inner-blocks.js b/packages/edit-widgets/src/blocks/widget-area/edit/inner-blocks.js
index 7b27a404a2f6c8..15ca45640a4c1a 100644
--- a/packages/edit-widgets/src/blocks/widget-area/edit/inner-blocks.js
+++ b/packages/edit-widgets/src/blocks/widget-area/edit/inner-blocks.js
@@ -15,7 +15,7 @@ export default function WidgetAreaInnerBlocks() {
 			onInput={ onInput }
 			onChange={ onChange }
 			templateLock={ false }
-			renderAppender={ InnerBlocks.DefaultBlockAppender }
+			renderAppender={ InnerBlocks.ButtonBlockAppender }
 		/>
 	);
 }
diff --git a/packages/edit-widgets/src/components/header/style.scss b/packages/edit-widgets/src/components/header/style.scss
index 3b64974e54afb5..16a2c33be2ddc0 100644
--- a/packages/edit-widgets/src/components/header/style.scss
+++ b/packages/edit-widgets/src/components/header/style.scss
@@ -25,6 +25,19 @@
 
 .edit-widgets-header__actions {
 	display: flex;
+
+	.components-button {
+		margin-right: $grid-unit-05;
+
+		@include break-small() {
+			margin-right: $grid-unit-15;
+		}
+	}
+
+	.edit-widgets-more-menu .components-button,
+	.interface-pinned-items .components-button {
+		margin-right: 0;
+	}
 }
 
 .edit-widgets-header-toolbar {
diff --git a/packages/edit-widgets/src/components/layout/interface.js b/packages/edit-widgets/src/components/layout/interface.js
index 22320cac6b1f0e..cb5d7a805aa2b5 100644
--- a/packages/edit-widgets/src/components/layout/interface.js
+++ b/packages/edit-widgets/src/components/layout/interface.js
@@ -7,7 +7,10 @@ import {
 	useViewportMatch,
 } from '@wordpress/compose';
 import { close } from '@wordpress/icons';
-import { __experimentalLibrary as Library } from '@wordpress/block-editor';
+import {
+	__experimentalLibrary as Library,
+	BlockBreadcrumb,
+} from '@wordpress/block-editor';
 import { useEffect } from '@wordpress/element';
 import { useDispatch, useSelect } from '@wordpress/data';
 import {
@@ -32,6 +35,8 @@ const interfaceLabels = {
 	body: __( 'Widgets and blocks' ),
 	/* translators: accessibility text for the widgets screen settings landmark region. */
 	sidebar: __( 'Widgets settings' ),
+	/* translators: accessibility text for the widgets screen footer landmark region. */
+	footer: __( 'Widgets footer' ),
 };
 
 function Interface( { blockEditorSettings } ) {
@@ -42,12 +47,19 @@ function Interface( { blockEditorSettings } ) {
 	);
 	const { rootClientId, insertionIndex } = useWidgetLibraryInsertionPoint();
 
-	const { hasSidebarEnabled, isInserterOpened } = useSelect(
+	const {
+		hasBlockBreadCrumbsEnabled,
+		hasSidebarEnabled,
+		isInserterOpened,
+	} = useSelect(
 		( select ) => ( {
 			hasSidebarEnabled: !! select(
 				interfaceStore
 			).getActiveComplementaryArea( editWidgetsStore.name ),
 			isInserterOpened: !! select( editWidgetsStore ).isInserterOpened(),
+			hasBlockBreadCrumbsEnabled: select(
+				editWidgetsStore
+			).__unstableIsFeatureActive( 'showBlockBreadcrumbs' ),
 		} ),
 		[]
 	);
@@ -107,6 +119,14 @@ function Interface( { blockEditorSettings } ) {
 					blockEditorSettings={ blockEditorSettings }
 				/>
 			}
+			footer={
+				hasBlockBreadCrumbsEnabled &&
+				! isMobileViewport && (
+					<div className="edit-widgets-layout__footer">
+						<BlockBreadcrumb rootLabelText={ __( 'Widgets' ) } />
+					</div>
+				)
+			}
 		/>
 	);
 }
diff --git a/packages/edit-widgets/src/components/more-menu/index.js b/packages/edit-widgets/src/components/more-menu/index.js
index 1a4dc6a8703bfc..2c93b5589232ba 100644
--- a/packages/edit-widgets/src/components/more-menu/index.js
+++ b/packages/edit-widgets/src/components/more-menu/index.js
@@ -117,6 +117,19 @@ export default function MoreMenu() {
 									'Contain text cursor inside block deactivated'
 								) }
 							/>
+							<FeatureToggle
+								feature="showBlockBreadcrumbs"
+								label={ __( 'Display block breadcrumbs' ) }
+								info={ __(
+									'Shows block breadcrumbs at the bottom of the editor.'
+								) }
+								messageActivated={ __(
+									'Display block breadcrumbs activated'
+								) }
+								messageDeactivated={ __(
+									'Display block breadcrumbs deactivated'
+								) }
+							/>
 						</MenuGroup>
 					</>
 				) }
diff --git a/packages/edit-widgets/src/index.js b/packages/edit-widgets/src/index.js
index c1582396ddef25..b69edb7b2fc132 100644
--- a/packages/edit-widgets/src/index.js
+++ b/packages/edit-widgets/src/index.js
@@ -12,7 +12,10 @@ import {
 	__experimentalRegisterExperimentalCoreBlocks,
 } from '@wordpress/block-library';
 import { __experimentalFetchLinkSuggestions as fetchLinkSuggestions } from '@wordpress/core-data';
-import { registerLegacyWidgetVariations } from '@wordpress/widgets';
+import {
+	registerLegacyWidgetBlock,
+	registerLegacyWidgetVariations,
+} from '@wordpress/widgets';
 
 /**
  * Internal dependencies
@@ -33,6 +36,7 @@ export function initialize( id, settings ) {
 		( block ) => ! [ 'core/more' ].includes( block.name )
 	);
 	registerCoreBlocks( coreBlocks );
+	registerLegacyWidgetBlock();
 	if ( process.env.GUTENBERG_PHASE === 2 ) {
 		__experimentalRegisterExperimentalCoreBlocks();
 	}
diff --git a/packages/edit-widgets/src/store/actions.js b/packages/edit-widgets/src/store/actions.js
index 7ae0bb06d65324..179723a85488e2 100644
--- a/packages/edit-widgets/src/store/actions.js
+++ b/packages/edit-widgets/src/store/actions.js
@@ -140,7 +140,9 @@ export function* saveWidgetArea( widgetAreaId ) {
 		// since order is important.
 		sidebarWidgetsIds.push( widgetId );
 
-		if ( widgetId ) {
+		// We need to check for the id in the widget object here, because a deleted
+		// and restored widget won't have this id.
+		if ( widget.id ) {
 			yield dispatch(
 				'core',
 				'editEntityRecord',
@@ -150,7 +152,8 @@ export function* saveWidgetArea( widgetAreaId ) {
 				{
 					...widget,
 					sidebar: widgetAreaId,
-				}
+				},
+				{ undoIgnore: true }
 			);
 
 			const hasEdits = yield select(
@@ -202,12 +205,9 @@ export function* saveWidgetArea( widgetAreaId ) {
 		const widget = preservedRecords[ i ];
 		const { block, position } = batchMeta[ i ];
 
-		yield dispatch(
-			'core/block-editor',
-			'updateBlockAttributes',
-			block.clientId,
-			{ __internalWidgetId: widget.id }
-		);
+		// Set __internalWidgetId on the block. This will be persisted to the
+		// store when we dispatch receiveEntityRecords( post ) below.
+		post.blocks[ position ].attributes.__internalWidgetId = widget.id;
 
 		const error = yield select(
 			'core',
@@ -243,7 +243,8 @@ export function* saveWidgetArea( widgetAreaId ) {
 		widgetAreaId,
 		{
 			widgets: sidebarWidgetsIds,
-		}
+		},
+		{ undoIgnore: true }
 	);
 
 	yield* trySaveWidgetArea( widgetAreaId );
diff --git a/packages/edit-widgets/src/store/defaults.js b/packages/edit-widgets/src/store/defaults.js
index 61227800b91f72..eac9b38f444808 100644
--- a/packages/edit-widgets/src/store/defaults.js
+++ b/packages/edit-widgets/src/store/defaults.js
@@ -2,5 +2,6 @@ export const PREFERENCES_DEFAULTS = {
 	features: {
 		fixedToolbar: false,
 		welcomeGuide: true,
+		showBlockBreadcrumbs: true,
 	},
 };
diff --git a/packages/edit-widgets/src/store/test/selectors.js b/packages/edit-widgets/src/store/test/selectors.js
new file mode 100644
index 00000000000000..47c96c0943dec7
--- /dev/null
+++ b/packages/edit-widgets/src/store/test/selectors.js
@@ -0,0 +1,29 @@
+/**
+ * Internal dependencies
+ */
+
+import { __unstableIsFeatureActive } from '../selectors';
+
+describe( 'selectors', () => {
+	describe( '__unstableIsFeatureActive', () => {
+		it( 'should return the feature value when present', () => {
+			const state = {
+				preferences: {
+					features: { isNightVisionActivated: true },
+				},
+			};
+			expect(
+				__unstableIsFeatureActive( state, 'isNightVisionActivated' )
+			).toBe( true );
+		} );
+
+		it( 'should return false where feature is not found', () => {
+			const state = {
+				preferences: {},
+			};
+			expect(
+				__unstableIsFeatureActive( state, 'didILeaveTheOvenOn' )
+			).toBe( false );
+		} );
+	} );
+} );
diff --git a/packages/widgets/package.json b/packages/widgets/package.json
index 728213cd52ff16..fe46cb0f44d96c 100644
--- a/packages/widgets/package.json
+++ b/packages/widgets/package.json
@@ -21,12 +21,20 @@
 	"react-native": "src/index",
 	"dependencies": {
 		"@babel/runtime": "^7.13.10",
+		"@wordpress/api-fetch": "file:../api-fetch",
+		"@wordpress/block-editor": "file:../block-editor",
 		"@wordpress/blocks": "file:../blocks",
 		"@wordpress/components": "file:../components",
+		"@wordpress/compose": "file:../compose",
 		"@wordpress/core-data": "file:../core-data",
 		"@wordpress/data": "file:../data",
+		"@wordpress/element": "file:../element",
 		"@wordpress/i18n": "file:../i18n",
-		"@wordpress/icons": "file:../icons"
+		"@wordpress/icons": "file:../icons",
+		"@wordpress/notices": "file:../notices",
+		"@wordpress/url": "file:../url",
+		"classnames": "^2.2.5",
+		"lodash": "^4.17.21"
 	},
 	"publishConfig": {
 		"access": "public"
diff --git a/packages/block-library/src/legacy-widget/README.md b/packages/widgets/src/blocks/legacy-widget/README.md
similarity index 100%
rename from packages/block-library/src/legacy-widget/README.md
rename to packages/widgets/src/blocks/legacy-widget/README.md
diff --git a/packages/block-library/src/legacy-widget/block.json b/packages/widgets/src/blocks/legacy-widget/block.json
similarity index 100%
rename from packages/block-library/src/legacy-widget/block.json
rename to packages/widgets/src/blocks/legacy-widget/block.json
diff --git a/packages/block-library/src/legacy-widget/edit/control.js b/packages/widgets/src/blocks/legacy-widget/edit/control.js
similarity index 100%
rename from packages/block-library/src/legacy-widget/edit/control.js
rename to packages/widgets/src/blocks/legacy-widget/edit/control.js
diff --git a/packages/block-library/src/legacy-widget/edit/convert-to-blocks-button.js b/packages/widgets/src/blocks/legacy-widget/edit/convert-to-blocks-button.js
similarity index 100%
rename from packages/block-library/src/legacy-widget/edit/convert-to-blocks-button.js
rename to packages/widgets/src/blocks/legacy-widget/edit/convert-to-blocks-button.js
diff --git a/packages/block-library/src/legacy-widget/edit/form.js b/packages/widgets/src/blocks/legacy-widget/edit/form.js
similarity index 100%
rename from packages/block-library/src/legacy-widget/edit/form.js
rename to packages/widgets/src/blocks/legacy-widget/edit/form.js
diff --git a/packages/block-library/src/legacy-widget/edit/index.js b/packages/widgets/src/blocks/legacy-widget/edit/index.js
similarity index 100%
rename from packages/block-library/src/legacy-widget/edit/index.js
rename to packages/widgets/src/blocks/legacy-widget/edit/index.js
diff --git a/packages/block-library/src/legacy-widget/edit/inspector-card.js b/packages/widgets/src/blocks/legacy-widget/edit/inspector-card.js
similarity index 100%
rename from packages/block-library/src/legacy-widget/edit/inspector-card.js
rename to packages/widgets/src/blocks/legacy-widget/edit/inspector-card.js
diff --git a/packages/block-library/src/legacy-widget/edit/no-preview.js b/packages/widgets/src/blocks/legacy-widget/edit/no-preview.js
similarity index 100%
rename from packages/block-library/src/legacy-widget/edit/no-preview.js
rename to packages/widgets/src/blocks/legacy-widget/edit/no-preview.js
diff --git a/packages/block-library/src/legacy-widget/edit/preview.js b/packages/widgets/src/blocks/legacy-widget/edit/preview.js
similarity index 100%
rename from packages/block-library/src/legacy-widget/edit/preview.js
rename to packages/widgets/src/blocks/legacy-widget/edit/preview.js
diff --git a/packages/block-library/src/legacy-widget/edit/widget-type-selector.js b/packages/widgets/src/blocks/legacy-widget/edit/widget-type-selector.js
similarity index 100%
rename from packages/block-library/src/legacy-widget/edit/widget-type-selector.js
rename to packages/widgets/src/blocks/legacy-widget/edit/widget-type-selector.js
diff --git a/packages/block-library/src/legacy-widget/editor.scss b/packages/widgets/src/blocks/legacy-widget/editor.scss
similarity index 98%
rename from packages/block-library/src/legacy-widget/editor.scss
rename to packages/widgets/src/blocks/legacy-widget/editor.scss
index 710e4d905879cf..0d9a2164754207 100644
--- a/packages/block-library/src/legacy-widget/editor.scss
+++ b/packages/widgets/src/blocks/legacy-widget/editor.scss
@@ -63,8 +63,9 @@
 
 .wp-block-legacy-widget__edit-no-preview {
 	background: $gray-100;
-	padding: $grid-unit-10 $grid-unit-15;
+	font-family: $default-font;
 	font-size: $default-font-size;
+	padding: $grid-unit-10 $grid-unit-15;
 
 	h3 {
 		font-size: 14px;
diff --git a/packages/block-library/src/legacy-widget/index.js b/packages/widgets/src/blocks/legacy-widget/index.js
similarity index 100%
rename from packages/block-library/src/legacy-widget/index.js
rename to packages/widgets/src/blocks/legacy-widget/index.js
diff --git a/packages/block-library/src/legacy-widget/index.php b/packages/widgets/src/blocks/legacy-widget/index.php
similarity index 100%
rename from packages/block-library/src/legacy-widget/index.php
rename to packages/widgets/src/blocks/legacy-widget/index.php
diff --git a/packages/block-library/src/legacy-widget/transforms.js b/packages/widgets/src/blocks/legacy-widget/transforms.js
similarity index 100%
rename from packages/block-library/src/legacy-widget/transforms.js
rename to packages/widgets/src/blocks/legacy-widget/transforms.js
diff --git a/packages/widgets/src/index.js b/packages/widgets/src/index.js
index 03f11440474a82..c02afc7a3f57cf 100644
--- a/packages/widgets/src/index.js
+++ b/packages/widgets/src/index.js
@@ -1,3 +1,27 @@
+/**
+ * WordPress dependencies
+ */
+import { registerBlockType } from '@wordpress/blocks';
+
+/**
+ * Internal dependencies
+ */
+import * as legacyWidget from './blocks/legacy-widget';
+
 export * from './components';
-export { default as registerLegacyWidgetVariations } from './register-legacy-widget-variations';
 export * from './utils';
+
+/**
+ * Registers the Legacy Widget block.
+ *
+ * Note that for the block to be useful, any scripts required by a widget must
+ * be loaded into the page.
+ *
+ * @see https://developer.wordpress.org/block-editor/how-to-guides/widgets/legacy-widget-block/
+ */
+export function registerLegacyWidgetBlock() {
+	const { metadata, settings, name } = legacyWidget;
+	registerBlockType( { name, ...metadata }, settings );
+}
+
+export { default as registerLegacyWidgetVariations } from './register-legacy-widget-variations';
diff --git a/packages/widgets/src/style.scss b/packages/widgets/src/style.scss
new file mode 100644
index 00000000000000..4ba09348938568
--- /dev/null
+++ b/packages/widgets/src/style.scss
@@ -0,0 +1 @@
+@import "./blocks/legacy-widget/editor.scss";
diff --git a/phpunit/class-wp-theme-json-resolver-test.php b/phpunit/class-wp-theme-json-resolver-test.php
index 9b1c6792a299bf..ce003aeb6087b7 100644
--- a/phpunit/class-wp-theme-json-resolver-test.php
+++ b/phpunit/class-wp-theme-json-resolver-test.php
@@ -155,15 +155,17 @@ function test_translations_are_applied() {
 			array(
 				'color'  => array(
 					'palette' => array(
-						array(
-							'slug'  => 'light',
-							'name'  => 'Jasny',
-							'color' => '#f5f7f9',
-						),
-						array(
-							'slug'  => 'dark',
-							'name'  => 'Ciemny',
-							'color' => '#000',
+						'theme' => array(
+							array(
+								'slug'  => 'light',
+								'name'  => 'Jasny',
+								'color' => '#f5f7f9',
+							),
+							array(
+								'slug'  => 'dark',
+								'name'  => 'Ciemny',
+								'color' => '#000',
+							),
 						),
 					),
 					'custom'  => false,
@@ -172,10 +174,12 @@ function test_translations_are_applied() {
 					'core/paragraph' => array(
 						'color' => array(
 							'palette' => array(
-								array(
-									'slug'  => 'light',
-									'name'  => 'Jasny',
-									'color' => '#f5f7f9',
+								'theme' => array(
+									array(
+										'slug'  => 'light',
+										'name'  => 'Jasny',
+										'color' => '#f5f7f9',
+									),
 								),
 							),
 						),
diff --git a/phpunit/class-wp-theme-json-schema-v0-test.php b/phpunit/class-wp-theme-json-schema-v0-test.php
index aad503dc7c1616..bb7828d0e2fa0a 100644
--- a/phpunit/class-wp-theme-json-schema-v0-test.php
+++ b/phpunit/class-wp-theme-json-schema-v0-test.php
@@ -283,9 +283,11 @@ function test_get_settings() {
 				'custom'         => false,
 				'customGradient' => false,
 				'palette'        => array(
-					array(
-						'slug'  => 'grey',
-						'color' => 'grey',
+					'theme' => array(
+						array(
+							'slug'  => 'grey',
+							'color' => 'grey',
+						),
 					),
 				),
 			),
@@ -295,9 +297,11 @@ function test_get_settings() {
 						'customGradient' => false,
 						'custom'         => false,
 						'palette'        => array(
-							array(
-								'slug'  => 'grey',
-								'color' => 'grey',
+							'theme' => array(
+								array(
+									'slug'  => 'grey',
+									'color' => 'grey',
+								),
 							),
 						),
 					),
@@ -307,9 +311,11 @@ function test_get_settings() {
 						'customGradient' => false,
 						'custom'         => false,
 						'palette'        => array(
-							array(
-								'slug'  => 'grey',
-								'color' => 'grey',
+							'theme' => array(
+								array(
+									'slug'  => 'grey',
+									'color' => 'grey',
+								),
 							),
 						),
 					),
@@ -319,9 +325,11 @@ function test_get_settings() {
 						'customGradient' => false,
 						'custom'         => false,
 						'palette'        => array(
-							array(
-								'slug'  => 'grey',
-								'color' => 'grey',
+							'theme' => array(
+								array(
+									'slug'  => 'grey',
+									'color' => 'grey',
+								),
 							),
 						),
 					),
@@ -335,128 +343,130 @@ function test_get_settings() {
 	function test_get_stylesheet() {
 		$root_name       = WP_Theme_JSON_Schema_V0::ROOT_BLOCK_NAME;
 		$all_blocks_name = WP_Theme_JSON_Schema_V0::ALL_BLOCKS_NAME;
-
-		$theme_json = new WP_Theme_JSON_Gutenberg(
-			array(
-				'settings' => array(
-					$all_blocks_name => array(
-						'color'      => array(
-							'text'    => 'value',
-							'palette' => array(
-								array(
-									'slug'  => 'white',
-									'color' => 'white',
-								),
-								array(
-									'slug'  => 'black',
-									'color' => 'black',
+		$theme_json      = new WP_Theme_JSON_Gutenberg( array() );
+		$theme_json->merge(
+			new WP_Theme_JSON_Gutenberg(
+				array(
+					'settings' => array(
+						$all_blocks_name => array(
+							'color'      => array(
+								'text'    => 'value',
+								'palette' => array(
+									array(
+										'slug'  => 'white',
+										'color' => 'white',
+									),
+									array(
+										'slug'  => 'black',
+										'color' => 'black',
+									),
 								),
 							),
-						),
-						'typography' => array(
-							'fontFamilies' => array(
-								array(
-									'slug'       => 'small',
-									'fontFamily' => '14px',
+							'typography' => array(
+								'fontFamilies' => array(
+									array(
+										'slug'       => 'small',
+										'fontFamily' => '14px',
+									),
+									array(
+										'slug'       => 'big',
+										'fontFamily' => '41px',
+									),
 								),
-								array(
-									'slug'       => 'big',
-									'fontFamily' => '41px',
+							),
+							'misc'       => 'value',
+						),
+						$root_name       => array(
+							'color' => array(
+								'palette' => array(
+									array(
+										'slug'  => 'grey',
+										'color' => 'grey',
+									),
 								),
 							),
 						),
-						'misc'       => 'value',
-					),
-					$root_name       => array(
-						'color' => array(
-							'palette' => array(
-								array(
-									'slug'  => 'grey',
-									'color' => 'grey',
+						'core/group'     => array(
+							'custom' => array(
+								'base-font'   => 16,
+								'line-height' => array(
+									'small'  => 1.2,
+									'medium' => 1.4,
+									'large'  => 1.8,
 								),
 							),
 						),
 					),
-					'core/group'     => array(
-						'custom' => array(
-							'base-font'   => 16,
-							'line-height' => array(
-								'small'  => 1.2,
-								'medium' => 1.4,
-								'large'  => 1.8,
+					'styles'   => array(
+						$root_name            => array(
+							'color' => array(
+								'link' => '#111',
+								'text' => 'var:preset|color|grey',
 							),
+							'misc'  => 'value',
 						),
-					),
-				),
-				'styles'   => array(
-					$root_name            => array(
-						'color' => array(
-							'link' => '#111',
-							'text' => 'var:preset|color|grey',
-						),
-						'misc'  => 'value',
-					),
-					'core/group'          => array(
-						'color'   => array(
-							'link' => '#333',
-						),
-						'spacing' => array(
-							'padding' => array(
-								'top'    => '12px',
-								'bottom' => '24px',
+						'core/group'          => array(
+							'color'   => array(
+								'link' => '#333',
+							),
+							'spacing' => array(
+								'padding' => array(
+									'top'    => '12px',
+									'bottom' => '24px',
+								),
 							),
 						),
-					),
-					'core/heading/h1'     => array(
-						'color'      => array(
-							'link' => '#111',
-						),
-						'typography' => array(
-							'fontSize' => '1em',
-						),
-					),
-					'core/heading/h2'     => array(
-						'color'      => array(
-							'link' => '#222',
-						),
-						'typography' => array(
-							'fontSize' => '2em',
-						),
-					),
-					'core/post-title/h2'  => array(
-						'color'      => array(
-							'link' => '#222',
-						),
-						'typography' => array(
-							'fontSize' => '2em',
-						),
-					),
-					'core/post-title/h5'  => array(
-						'color'      => array(
-							'link' => '#555',
+						'core/heading/h1'     => array(
+							'color'      => array(
+								'link' => '#111',
+							),
+							'typography' => array(
+								'fontSize' => '1em',
+							),
 						),
-						'typography' => array(
-							'fontSize' => '5em',
+						'core/heading/h2'     => array(
+							'color'      => array(
+								'link' => '#222',
+							),
+							'typography' => array(
+								'fontSize' => '2em',
+							),
 						),
-					),
-					'core/query-title/h4' => array(
-						'color'      => array(
-							'link' => '#444',
+						'core/post-title/h2'  => array(
+							'color'      => array(
+								'link' => '#222',
+							),
+							'typography' => array(
+								'fontSize' => '2em',
+							),
 						),
-						'typography' => array(
-							'fontSize' => '4em',
+						'core/post-title/h5'  => array(
+							'color'      => array(
+								'link' => '#555',
+							),
+							'typography' => array(
+								'fontSize' => '5em',
+							),
 						),
-					),
-					'core/query-title/h5' => array(
-						'color'      => array(
-							'link' => '#555',
+						'core/query-title/h4' => array(
+							'color'      => array(
+								'link' => '#444',
+							),
+							'typography' => array(
+								'fontSize' => '4em',
+							),
 						),
-						'typography' => array(
-							'fontSize' => '5em',
+						'core/query-title/h5' => array(
+							'color'      => array(
+								'link' => '#555',
+							),
+							'typography' => array(
+								'fontSize' => '5em',
+							),
 						),
 					),
-				),
-				'misc'     => 'value',
+					'misc'     => 'value',
+				)
 			)
 		);
 
diff --git a/phpunit/class-wp-theme-json-test.php b/phpunit/class-wp-theme-json-test.php
index fa3a4931a561b2..4cba5bc5c7864b 100644
--- a/phpunit/class-wp-theme-json-test.php
+++ b/phpunit/class-wp-theme-json-test.php
@@ -56,6 +56,131 @@ function test_get_settings() {
 		$this->assertEqualSetsWithIndex( $expected, $actual );
 	}
 
+	function test_get_settings_presets_are_keyed_by_origin() {
+		$core_origin = new WP_Theme_JSON_Gutenberg(
+			array(
+				'version'  => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
+				'settings' => array(
+					'color'       => array(
+						'palette' => array(
+							array(
+								'slug'  => 'white',
+								'color' => 'white',
+							),
+						),
+					),
+					'invalid/key' => 'value',
+					'blocks'      => array(
+						'core/group' => array(
+							'color' => array(
+								'palette' => array(
+									array(
+										'slug'  => 'white',
+										'color' => 'white',
+									),
+								),
+							),
+						),
+					),
+				),
+			),
+			'core'
+		);
+		$no_origin   = new WP_Theme_JSON_Gutenberg(
+			array(
+				'version'  => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
+				'settings' => array(
+					'color'       => array(
+						'palette' => array(
+							array(
+								'slug'  => 'black',
+								'color' => 'black',
+							),
+						),
+					),
+					'invalid/key' => 'value',
+					'blocks'      => array(
+						'core/group' => array(
+							'color' => array(
+								'palette' => array(
+									array(
+										'slug'  => 'black',
+										'color' => 'black',
+									),
+								),
+							),
+						),
+					),
+				),
+			)
+		);
+
+		$actual_core      = $core_origin->get_raw_data();
+		$actual_no_origin = $no_origin->get_raw_data();
+
+		$expected_core      = array(
+			'version'  => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
+			'settings' => array(
+				'color'  => array(
+					'palette' => array(
+						'core' => array(
+							array(
+								'slug'  => 'white',
+								'color' => 'white',
+							),
+						),
+					),
+				),
+				'blocks' => array(
+					'core/group' => array(
+						'color' => array(
+							'palette' => array(
+								'core' => array(
+									array(
+										'slug'  => 'white',
+										'color' => 'white',
+									),
+								),
+							),
+						),
+					),
+				),
+			),
+		);
+		$expected_no_origin = array(
+			'version'  => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
+			'settings' => array(
+				'color'  => array(
+					'palette' => array(
+						'theme' => array(
+							array(
+								'slug'  => 'black',
+								'color' => 'black',
+							),
+						),
+					),
+				),
+				'blocks' => array(
+					'core/group' => array(
+						'color' => array(
+							'palette' => array(
+								'theme' => array(
+									array(
+										'slug'  => 'black',
+										'color' => 'black',
+									),
+								),
+							),
+						),
+					),
+				),
+			),
+		);
+
+		$this->assertEqualSetsWithIndex( $expected_core, $actual_core );
+		$this->assertEqualSetsWithIndex( $expected_no_origin, $actual_no_origin );
+	}
+
 	function test_get_stylesheet() {
 		$theme_json = new WP_Theme_JSON_Gutenberg(
 			array(
@@ -269,7 +394,8 @@ public function test_get_stylesheet_preset_values_are_marked_as_important() {
 						),
 					),
 				),
-			)
+			),
+			'core'
 		);
 
 		$this->assertEquals(
@@ -279,35 +405,37 @@ public function test_get_stylesheet_preset_values_are_marked_as_important() {
 	}
 
 	public function test_merge_incoming_data() {
-		$initial = array(
-			'version'  => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
-			'settings' => array(
-				'color'  => array(
-					'custom'  => false,
-					'palette' => array(
-						array(
-							'slug'  => 'red',
-							'color' => 'red',
-						),
-						array(
-							'slug'  => 'green',
-							'color' => 'green',
+		$theme_json = new WP_Theme_JSON_Gutenberg(
+			array(
+				'version'  => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
+				'settings' => array(
+					'color'  => array(
+						'custom'  => false,
+						'palette' => array(
+							array(
+								'slug'  => 'red',
+								'color' => 'red',
+							),
+							array(
+								'slug'  => 'green',
+								'color' => 'green',
+							),
 						),
 					),
-				),
-				'blocks' => array(
-					'core/paragraph' => array(
-						'color' => array(
-							'custom' => false,
+					'blocks' => array(
+						'core/paragraph' => array(
+							'color' => array(
+								'custom' => false,
+							),
 						),
 					),
 				),
-			),
-			'styles'   => array(
-				'typography' => array(
-					'fontSize' => '12',
+				'styles'   => array(
+					'typography' => array(
+						'fontSize' => '12',
+					),
 				),
-			),
+			)
 		);
 
 		$add_new_block = array(
@@ -437,37 +565,37 @@ public function test_merge_incoming_data() {
 					'custom'         => true,
 					'customGradient' => true,
 					'palette'        => array(
-						array(
-							'slug'  => 'red',
-							'color' => 'red',
-						),
-						array(
-							'slug'  => 'green',
-							'color' => 'green',
-						),
-						array(
-							'slug'  => 'blue',
-							'color' => 'blue',
+						'theme' => array(
+							array(
+								'slug'  => 'blue',
+								'color' => 'blue',
+							),
 						),
 					),
 					'gradients'      => array(
-						array(
-							'slug'     => 'gradient',
-							'gradient' => 'gradient',
+						'theme' => array(
+							array(
+								'slug'     => 'gradient',
+								'gradient' => 'gradient',
+							),
 						),
 					),
 				),
 				'typography' => array(
 					'fontSizes'    => array(
-						array(
-							'slug' => 'fontSize',
-							'size' => 'fontSize',
+						'theme' => array(
+							array(
+								'slug' => 'fontSize',
+								'size' => 'fontSize',
+							),
 						),
 					),
 					'fontFamilies' => array(
-						array(
-							'slug'       => 'fontFamily',
-							'fontFamily' => 'fontFamily',
+						'theme' => array(
+							array(
+								'slug'       => 'fontFamily',
+								'fontFamily' => 'fontFamily',
+							),
 						),
 					),
 				),
@@ -509,7 +637,6 @@ public function test_merge_incoming_data() {
 			),
 		);
 
-		$theme_json = new WP_Theme_JSON_Gutenberg( $initial );
 		$theme_json->merge( new WP_Theme_JSON_Gutenberg( $add_new_block ) );
 		$theme_json->merge( new WP_Theme_JSON_Gutenberg( $add_key_in_settings ) );
 		$theme_json->merge( new WP_Theme_JSON_Gutenberg( $update_key_in_settings ) );
@@ -523,7 +650,7 @@ public function test_merge_incoming_data() {
 	}
 
 	function test_remove_insecure_properties_removes_unsafe_styles() {
-		$theme_json = new WP_Theme_JSON_Gutenberg(
+		$actual = WP_Theme_JSON_Gutenberg::remove_insecure_properties(
 			array(
 				'version' => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
 				'styles'  => array(
@@ -560,11 +687,9 @@ function test_remove_insecure_properties_removes_unsafe_styles() {
 						),
 					),
 				),
-			),
-			true
+			)
 		);
-		$theme_json->remove_insecure_properties();
-		$actual   = $theme_json->get_raw_data();
+
 		$expected = array(
 			'version' => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
 			'styles'  => array(
@@ -599,7 +724,7 @@ function test_remove_insecure_properties_removes_unsafe_styles() {
 	}
 
 	function test_remove_insecure_properties_removes_unsafe_styles_sub_properties() {
-		$theme_json = new WP_Theme_JSON_Gutenberg(
+		$actual = WP_Theme_JSON_Gutenberg::remove_insecure_properties(
 			array(
 				'version' => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
 				'styles'  => array(
@@ -651,8 +776,7 @@ function test_remove_insecure_properties_removes_unsafe_styles_sub_properties()
 			),
 			true
 		);
-		$theme_json->remove_insecure_properties();
-		$actual   = $theme_json->get_raw_data();
+
 		$expected = array(
 			'version' => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
 			'styles'  => array(
@@ -702,7 +826,7 @@ function test_remove_insecure_properties_removes_unsafe_styles_sub_properties()
 	}
 
 	function test_remove_insecure_properties_removes_non_preset_settings() {
-		$theme_json = new WP_Theme_JSON_Gutenberg(
+		$actual = WP_Theme_JSON_Gutenberg::remove_insecure_properties(
 			array(
 				'version'  => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
 				'settings' => array(
@@ -757,11 +881,9 @@ function test_remove_insecure_properties_removes_non_preset_settings() {
 						),
 					),
 				),
-			),
-			true
+			)
 		);
-		$theme_json->remove_insecure_properties();
-		$result   = $theme_json->get_raw_data();
+
 		$expected = array(
 			'version'  => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
 			'settings' => array(
@@ -809,11 +931,11 @@ function test_remove_insecure_properties_removes_non_preset_settings() {
 				),
 			),
 		);
-		$this->assertEqualSetsWithIndex( $expected, $result );
+		$this->assertEqualSetsWithIndex( $expected, $actual );
 	}
 
 	function test_remove_insecure_properties_removes_unsafe_preset_settings() {
-		$theme_json = new WP_Theme_JSON_Gutenberg(
+		$actual = WP_Theme_JSON_Gutenberg::remove_insecure_properties(
 			array(
 				'version'  => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
 				'settings' => array(
@@ -894,11 +1016,9 @@ function test_remove_insecure_properties_removes_unsafe_preset_settings() {
 						),
 					),
 				),
-			),
-			true
+			)
 		);
-		$theme_json->remove_insecure_properties();
-		$result   = $theme_json->get_raw_data();
+
 		$expected = array(
 			'version'  => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
 			'settings' => array(
@@ -935,11 +1055,11 @@ function test_remove_insecure_properties_removes_unsafe_preset_settings() {
 				),
 			),
 		);
-		$this->assertEqualSetsWithIndex( $expected, $result );
+		$this->assertEqualSetsWithIndex( $expected, $actual );
 	}
 
 	function test_remove_insecure_properties_applies_safe_styles() {
-		$theme_json = new WP_Theme_JSON_Gutenberg(
+		$actual = WP_Theme_JSON_Gutenberg::remove_insecure_properties(
 			array(
 				'version' => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
 				'styles'  => array(
@@ -950,8 +1070,7 @@ function test_remove_insecure_properties_applies_safe_styles() {
 			),
 			true
 		);
-		$theme_json->remove_insecure_properties();
-		$result   = $theme_json->get_raw_data();
+
 		$expected = array(
 			'version' => WP_Theme_JSON_Gutenberg::LATEST_SCHEMA,
 			'styles'  => array(
@@ -960,7 +1079,7 @@ function test_remove_insecure_properties_applies_safe_styles() {
 				),
 			),
 		);
-		$this->assertEqualSetsWithIndex( $expected, $result );
+		$this->assertEqualSetsWithIndex( $expected, $actual );
 	}
 
 	function test_get_custom_templates() {
diff --git a/webpack.config.js b/webpack.config.js
index e319703d77d5a8..acb2e7a1f405c6 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -248,6 +248,7 @@ module.exports = {
 				'./packages/block-library/src/': 'build/block-library/blocks/',
 				'./packages/edit-widgets/src/blocks/':
 					'build/edit-widgets/blocks/',
+				'./packages/widgets/src/blocks/': 'build/widgets/blocks/',
 			} ).flatMap( ( [ from, to ] ) => [
 				{
 					from: `${ from }/**/index.php`,