diff --git a/package.json b/package.json
index 73f02969a0509..396ae5589560b 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
 		"url": "https://develop.svn.wordpress.org/trunk"
 	},
 	"gutenberg": {
-		"sha": "3a4e8d1418d25da83b70158bcaabf65580690b6b",
+		"sha": "a2a354cf35e5b69c3330d6c1cfd42d8dc2efb9fd",
 		"ghcrRepo": "WordPress/gutenberg/gutenberg-wp-develop-build"
 	},
 	"engines": {
diff --git a/src/wp-includes/assets/script-loader-packages.php b/src/wp-includes/assets/script-loader-packages.php
index 143f871840afa..fa631e47f7afd 100644
--- a/src/wp-includes/assets/script-loader-packages.php
+++ b/src/wp-includes/assets/script-loader-packages.php
@@ -266,7 +266,7 @@
 			'wp-url',
 			'wp-warning'
 		),
-		'version' => '515bcc5a2962232ccea7'
+		'version' => '89931f90e4df5eb5f8a3'
 	),
 	'customize-widgets.js' => array(
 		'dependencies' => array(
@@ -381,7 +381,7 @@
 				'import' => 'static'
 			)
 		),
-		'version' => '1975171eba5481ff37cd'
+		'version' => '28ef50b859708963e197'
 	),
 	'edit-site.js' => array(
 		'dependencies' => array(
@@ -519,7 +519,7 @@
 				'import' => 'static'
 			)
 		),
-		'version' => '77209b33a51951b61574'
+		'version' => '37faadbdf6c40cb0c71c'
 	),
 	'element.js' => array(
 		'dependencies' => array(
diff --git a/src/wp-includes/assets/script-modules-packages.php b/src/wp-includes/assets/script-modules-packages.php
index d8238c74e65a0..7ece82f318d50 100644
--- a/src/wp-includes/assets/script-modules-packages.php
+++ b/src/wp-includes/assets/script-modules-packages.php
@@ -211,7 +211,7 @@
 		'dependencies' => array(
 			
 		),
-		'version' => '4d2a3a72c7410d548881'
+		'version' => 'efaa5193bbad9c60ffd1'
 	),
 	'interactivity-router/full-page.js' => array(
 		'dependencies' => array(
diff --git a/src/wp-includes/build/pages/font-library/page-wp-admin.php b/src/wp-includes/build/pages/font-library/page-wp-admin.php
index 4d41be02ae892..b5974ceca1e53 100644
--- a/src/wp-includes/build/pages/font-library/page-wp-admin.php
+++ b/src/wp-includes/build/pages/font-library/page-wp-admin.php
@@ -153,12 +153,35 @@ function wp_font_library_wp_admin_enqueue_scripts( $hook_suffix ) {
 		// 2. It initializes the boot module as an inline script.
 		wp_register_script( 'font-library-wp-admin-prerequisites', '', $asset['dependencies'], $asset['version'], true );
 
-		// Add inline script to initialize the app using initSinglePage (no menuItems)
+		/*
+		 * Add inline script to initialize the app using initSinglePage (no menuItems).
+		 * The dynamic import is deferred until DOMContentLoaded so that all classic
+		 * script dependencies of @wordpress/boot (wp-private-apis, wp-components,
+		 * wp-theme, etc.) have finished parsing and executing before the boot module
+		 * evaluates. Otherwise, a modulepreloaded @wordpress/boot can win the race
+		 * against the classic-script-printing pass on fast CDN-fronted hosts in
+		 * Chrome, evaluating before wp.theme.privateApis is defined and throwing
+		 * "Cannot unlock an undefined object". See <https://core.trac.wordpress.org/ticket/65103>.
+		 */
+		$init_js_function = <<<'JS'
+		( mountId, routes ) => {
+			const run = async () => {
+				const mod = await import( "@wordpress/boot" );
+				mod.initSinglePage( { mountId, routes } );
+			};
+			if ( document.readyState === "loading" ) {
+				document.addEventListener( "DOMContentLoaded", run );
+			} else {
+				run();
+			}
+		}
+		JS;
 		wp_add_inline_script(
 			'font-library-wp-admin-prerequisites',
 			sprintf(
-				'import("@wordpress/boot").then(mod => mod.initSinglePage({mountId: "%s", routes: %s}));',
-				'font-library-wp-admin-app',
+				'( %s )( %s, %s );',
+				$init_js_function,
+				wp_json_encode( 'font-library-wp-admin-app', JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ),
 				wp_json_encode( $routes, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES )
 			)
 		);
diff --git a/src/wp-includes/build/pages/options-connectors/page-wp-admin.php b/src/wp-includes/build/pages/options-connectors/page-wp-admin.php
index 3f3048b8fb98b..b8937db2e2b91 100644
--- a/src/wp-includes/build/pages/options-connectors/page-wp-admin.php
+++ b/src/wp-includes/build/pages/options-connectors/page-wp-admin.php
@@ -153,12 +153,35 @@ function wp_options_connectors_wp_admin_enqueue_scripts( $hook_suffix ) {
 		// 2. It initializes the boot module as an inline script.
 		wp_register_script( 'options-connectors-wp-admin-prerequisites', '', $asset['dependencies'], $asset['version'], true );
 
-		// Add inline script to initialize the app using initSinglePage (no menuItems)
+		/*
+		 * Add inline script to initialize the app using initSinglePage (no menuItems).
+		 * The dynamic import is deferred until DOMContentLoaded so that all classic
+		 * script dependencies of @wordpress/boot (wp-private-apis, wp-components,
+		 * wp-theme, etc.) have finished parsing and executing before the boot module
+		 * evaluates. Otherwise, a modulepreloaded @wordpress/boot can win the race
+		 * against the classic-script-printing pass on fast CDN-fronted hosts in
+		 * Chrome, evaluating before wp.theme.privateApis is defined and throwing
+		 * "Cannot unlock an undefined object". See <https://core.trac.wordpress.org/ticket/65103>.
+		 */
+		$init_js_function = <<<'JS'
+		( mountId, routes ) => {
+			const run = async () => {
+				const mod = await import( "@wordpress/boot" );
+				mod.initSinglePage( { mountId, routes } );
+			};
+			if ( document.readyState === "loading" ) {
+				document.addEventListener( "DOMContentLoaded", run );
+			} else {
+				run();
+			}
+		}
+		JS;
 		wp_add_inline_script(
 			'options-connectors-wp-admin-prerequisites',
 			sprintf(
-				'import("@wordpress/boot").then(mod => mod.initSinglePage({mountId: "%s", routes: %s}));',
-				'options-connectors-wp-admin-app',
+				'( %s )( %s, %s );',
+				$init_js_function,
+				wp_json_encode( 'options-connectors-wp-admin-app', JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ),
 				wp_json_encode( $routes, JSON_HEX_TAG | JSON_UNESCAPED_SLASHES )
 			)
 		);