Pullquote: fix transform to quote crash (#44315)

packages/block-library/src/quote/transforms.js

@@ -17,7 +17,7 @@ const transforms = {
 						fontSize,
 						style,
 					},
-					createBlock( 'core/paragraph', { content: value } )
+					[ createBlock( 'core/paragraph', { content: value } ) ]
 				);
 			},
 		},

packages/e2e-tests/specs/editor/blocks/pullquote.test.js

@@ -0,0 +1,47 @@
+/**
+ * WordPress dependencies
+ */
+import {
+	clickBlockAppender,
+	getEditedPostContent,
+	createNewPost,
+	transformBlockTo,
+} from '@wordpress/e2e-test-utils';
+
+describe( 'Quote', () => {
+	beforeEach( async () => {
+		await createNewPost();
+	} );
+
+	it( 'can be created by converting a quote and converted back to quote', async () => {
+		await clickBlockAppender();
+		await page.keyboard.type( 'test' );
+		await transformBlockTo( 'Quote' );
+
+		expect( await getEditedPostContent() ).toMatchInlineSnapshot( `
+		"<!-- wp:quote -->
+		<blockquote class=\\"wp-block-quote\\"><!-- wp:paragraph -->
+		<p>test</p>
+		<!-- /wp:paragraph --></blockquote>
+		<!-- /wp:quote -->"
+	` );
+
+		await transformBlockTo( 'Pullquote' );
+
+		expect( await getEditedPostContent() ).toMatchInlineSnapshot( `
+		"<!-- wp:pullquote -->
+		<figure class=\\"wp-block-pullquote\\"><blockquote><p>test</p></blockquote></figure>
+		<!-- /wp:pullquote -->"
+	` );
+
+		await transformBlockTo( 'Quote' );
+
+		expect( await getEditedPostContent() ).toMatchInlineSnapshot( `
+		"<!-- wp:quote -->
+		<blockquote class=\\"wp-block-quote\\"><!-- wp:paragraph -->
+		<p>test</p>
+		<!-- /wp:paragraph --></blockquote>
+		<!-- /wp:quote -->"
+	` );
+	} );
+} );