diff --git a/lib/compat/wordpress-5.9/rest-api.php b/lib/compat/wordpress-5.9/rest-api.php
index 0a450f5569cc1f..8414f9e514d15b 100644
--- a/lib/compat/wordpress-5.9/rest-api.php
+++ b/lib/compat/wordpress-5.9/rest-api.php
@@ -35,7 +35,7 @@ function gutenberg_register_rest_menu_location() {
  *
  * @return array
  */
-function wp_api_nav_menus_post_type_args( $args, $post_type ) {
+function gutenberg_api_nav_menus_post_type_args( $args, $post_type ) {
 	if ( 'nav_menu_item' === $post_type ) {
 		$args['show_in_rest']          = true;
 		$args['rest_base']             = 'menu-items';
@@ -44,7 +44,7 @@ function wp_api_nav_menus_post_type_args( $args, $post_type ) {
 
 	return $args;
 }
-add_filter( 'register_post_type_args', 'wp_api_nav_menus_post_type_args', 10, 2 );
+add_filter( 'register_post_type_args', 'gutenberg_api_nav_menus_post_type_args', 10, 2 );
 
 /**
  * Hook in to the nav_menu taxonomy and enable a taxonomy rest endpoint.
@@ -54,7 +54,7 @@ function wp_api_nav_menus_post_type_args( $args, $post_type ) {
  *
  * @return array
  */
-function wp_api_nav_menus_taxonomy_args( $args, $taxonomy ) {
+function gutenberg_api_nav_menus_taxonomy_args( $args, $taxonomy ) {
 	if ( 'nav_menu' === $taxonomy ) {
 		$args['show_in_rest']          = true;
 		$args['rest_base']             = 'menus';
@@ -63,7 +63,24 @@ function wp_api_nav_menus_taxonomy_args( $args, $taxonomy ) {
 
 	return $args;
 }
-add_filter( 'register_taxonomy_args', 'wp_api_nav_menus_taxonomy_args', 10, 2 );
+add_filter( 'register_taxonomy_args', 'gutenberg_api_nav_menus_taxonomy_args', 10, 2 );
+
+/**
+ * Exposes the site icon url to the Gutenberg editor through the WordPress REST
+ * API. The site icon url should instead be fetched from the wp/v2/settings
+ * endpoint when https://github.com/WordPress/gutenberg/pull/19967 is complete.
+ *
+ * @param WP_REST_Response $response Response data served by the WordPress REST index endpoint.
+ * @return WP_REST_Response
+ */
+function gutenberg_register_site_icon_url( $response ) {
+	$data                  = $response->data;
+	$data['site_icon_url'] = get_site_icon_url();
+	$response->set_data( $data );
+	return $response;
+}
+
+add_filter( 'rest_index', 'gutenberg_register_site_icon_url' );
 
 /**
  * Exposes the site logo to the Gutenberg editor through the WordPress REST
diff --git a/lib/compat/wordpress-6.0/edit-form-blocks.php b/lib/compat/wordpress-6.0/edit-form-blocks.php
index 68fc938e9e7420..490ebd5a38ead2 100644
--- a/lib/compat/wordpress-6.0/edit-form-blocks.php
+++ b/lib/compat/wordpress-6.0/edit-form-blocks.php
@@ -11,7 +11,7 @@
  * @param array $preload_paths Preload paths to be filtered.
  * @return array
  */
-function optimize_preload_paths( $preload_paths ) {
+function gutenberg_optimize_preload_paths( $preload_paths ) {
 	// remove preload of the `/` route.
 	$root_index = array_search( '/', $preload_paths, true );
 	if ( false !== $root_index ) {
@@ -48,7 +48,7 @@ function optimize_preload_paths( $preload_paths ) {
 
 	return $preload_paths;
 }
-add_filter( 'block_editor_rest_api_preload_paths', 'optimize_preload_paths' );
+add_filter( 'block_editor_rest_api_preload_paths', 'gutenberg_optimize_preload_paths' );
 
 /**
  * Disables loading remote block patterns from REST while initializing the editor.
@@ -57,10 +57,10 @@ function optimize_preload_paths( $preload_paths ) {
  *
  * @param WP_Screen $current_screen WordPress current screen object.
  */
-function disable_load_remote_patterns( $current_screen ) {
+function gutenberg_disable_load_remote_patterns( $current_screen ) {
 	$is_site_editor = ( function_exists( 'gutenberg_is_edit_site_page' ) && gutenberg_is_edit_site_page( $current_screen->id ) );
 	if ( $is_site_editor || $current_screen->is_block_editor() ) {
 		add_filter( 'should_load_remote_block_patterns', '__return_false' );
 	}
 }
-add_action( 'current_screen', 'disable_load_remote_patterns' );
+add_action( 'current_screen', 'gutenberg_disable_load_remote_patterns' );