diff --git a/lib/client-assets.php b/lib/client-assets.php
index fa1832d2f23729..4adc79fc689042 100644
--- a/lib/client-assets.php
+++ b/lib/client-assets.php
@@ -102,6 +102,20 @@ function gutenberg_override_script( $scripts, $handle, $src, $deps = array(), $v
 		$output = sprintf( "wp.i18n.setLocaleData( { 'text direction\u0004ltr': [ '%s' ] }, 'default' );", $ltr );
 		$scripts->add_inline_script( 'wp-i18n', $output, 'after' );
 	}
+
+	/*
+	 * Wp-editor module is exposed as window.wp.editor.
+	 * Problem: there is quite some code expecting window.wp.oldEditor object available under window.wp.editor.
+	 * Solution: fuse the two objects together to maintain backward compatibility.
+	 * For more context, see https://github.com/WordPress/gutenberg/issues/33203
+	 */
+	if ( 'wp-editor' === $handle ) {
+		$scripts->add_inline_script(
+			'wp-editor',
+			'Object.assign( window.wp.editor, window.wp.oldEditor );',
+			'after'
+		);
+	}
 }
 
 /**
diff --git a/packages/e2e-tests/specs/editor/plugins/wp-editor-meta-box.test.js b/packages/e2e-tests/specs/editor/plugins/wp-editor-meta-box.test.js
index 3045575ff15f5d..867c3cf7b40138 100644
--- a/packages/e2e-tests/specs/editor/plugins/wp-editor-meta-box.test.js
+++ b/packages/e2e-tests/specs/editor/plugins/wp-editor-meta-box.test.js
@@ -39,8 +39,20 @@ describe( 'WP Editor Meta Boxes', () => {
 			( textarea ) => textarea.value
 		);
 
-		expect( content ).toMatchInlineSnapshot(
-			`"<p>Typing in a metabox</p>"`
-		);
+		/*
+		 * `content` may or may not contain the <p> tags depending on hasWpautop value in this line:
+		 * https://github.com/WordPress/wordpress-develop/blob/2382765afa36e10bf3c74420024ad4e85763a47c/src/js/_enqueues/vendor/tinymce/plugins/wordpress/plugin.js#L15
+		 *
+		 * Now, for the purposes of this e2e test we explicitly set wpautop to true in the test plugin:
+		 * https://github.com/WordPress/gutenberg/blob/3da717b8d0ac7d7821fc6d0475695ccf3ae2829f/packages/e2e-tests/plugins/wp-editor-metabox.php#L36
+		 *
+		 * If this test randomly fails because of the actual value being wrapped in <p> like <p>Typing in a metabox</p>, it means that
+		 * hasWpautop has been errorneously set to false in the line above. You may want to check:
+		 * * Is window.wp.editor.autop a function? It should be one since https://github.com/WordPress/gutenberg/pull/33228
+		 * * Is wpautop still true in the second link mentioned in this comment?
+		 *
+		 * For more context, see https://github.com/WordPress/gutenberg/pull/33228/files#r666897885
+		 */
+		expect( content ).toBe( 'Typing in a metabox' );
 	} );
 } );