diff --git a/packages/playground/remote/src/lib/playground-mu-plugin/0-playground.php b/packages/playground/remote/src/lib/playground-mu-plugin/0-playground.php
index 269afebfab..7df5907c0f 100644
--- a/packages/playground/remote/src/lib/playground-mu-plugin/0-playground.php
+++ b/packages/playground/remote/src/lib/playground-mu-plugin/0-playground.php
@@ -99,7 +99,7 @@ function networking_disabled() {
  * This mu-plugin provides that transport. It's one of the two:
  *
  * * WP_Http_Fetch – Sends requests using browser's fetch() function.
- * * Requests_Transport_Dummy – Does not send any requests and only exists to keep
+ * * WP_Http_Dummy – Does not send any requests and only exists to keep
  * 								the Requests class happy.
  */
 $__requests_class = class_exists( '\WpOrg\Requests\Requests' ) ? '\WpOrg\Requests\Requests' : 'Requests';
@@ -107,12 +107,20 @@ function networking_disabled() {
 	require(__DIR__ . '/playground-includes/wp_http_fetch.php');
 	/**
 	 * Force the Fetch transport to be used in Requests.
-	 * The 'http_api_transports' filter was deprecated, and is no longer actively in use.
 	 */
 	add_action( 'requests-requests.before_request', function( $url, $headers, $data, $type, &$options ) {
 		$options['transport'] = 'Wp_Http_Fetch';
 	}, 10, 5 );
 
+	/**
+	 * Force wp_http_supports() to work, which uses deprecated WP_HTTP methods.
+	 * This filter is deprecated, and no longer actively used, but is needed for wp_http_supports().
+	 * @see https://core.trac.wordpress.org/ticket/37708
+	 */
+	add_filter('http_api_transports', function() {
+		return [ 'Fetch' ];
+	});
+
 	/**
 	 * Disable signature verification as it doesn't seem to work with
 	 * fetch requests:
@@ -137,6 +145,10 @@ function networking_disabled() {
 	add_action( 'requests-requests.before_request', function( $url, $headers, $data, $type, &$options ) {
 		$options['transport'] = 'Wp_Http_Dummy';
 	}, 10, 5 );
+
+	add_filter('http_api_transports', function() {
+		return [ 'Dummy' ];
+	});
 }
 
 ?>
diff --git a/packages/playground/website/cypress/e2e/query-api.cy.ts b/packages/playground/website/cypress/e2e/query-api.cy.ts
index e670d67cc8..01ed31f31e 100644
--- a/packages/playground/website/cypress/e2e/query-api.cy.ts
+++ b/packages/playground/website/cypress/e2e/query-api.cy.ts
@@ -85,9 +85,12 @@ describe('Query API', () => {
 
 		/**
 		 * @see https://github.com/WordPress/wordpress-playground/pull/1045
+		 * @see https://github.com/WordPress/wordpress-playground/pull/1504
 		 */
-		it('should enable networking when requested AND the kitchen sink extension bundle is enabled', () => {
-			cy.visit('/?networking=yes&url=/wp-admin/plugin-install.php');
+		it('should enable networking when requested AND the kitchen sink extension bundle is NOT enabled', () => {
+			cy.visit(
+				'/?networking=yes&php-extension-bundle=light&url=/wp-admin/plugin-install.php'
+			);
 			cy.wordPressDocument()
 				.find('.plugin-card')
 				.should('have.length.above', 4);
@@ -104,6 +107,7 @@ describe('Query API', () => {
 				features: {
 					networking: true,
 				},
+				phpExtensionBundles: ['light'],
 				steps: [
 					{
 						step: 'writeFile',