Fix Nav block invalid permissions warning by avoiding using trashed wp_navigation posts.

lib/compat/wordpress-6.1/class-gutenberg-rest-navigation-controller.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * REST API: Gutenberg_REST_Navigation_Controller class
+ *
+ * @package    Gutenberg
+ * @subpackage REST_API
+ */
+
+class Gutenberg_REST_Navigation_Controller extends WP_REST_Posts_Controller {
+
+	/**
+	 * Overide WP_REST_Posts_Controller function to discard
+	 * certain post statuses and treat as missing.
+	 *
+	 * @param int $id the ID of the Navigation post.
+	 * @return WP_Post|null
+	 */
+	protected function get_post( $id ) {
+
+		$result = parent::get_post( $id );
+
+		if ( is_wp_error( $result ) ) {
+			return $result;
+		}
+
+		$post = $result;
+
+		if ( 'publish' === $post->post_status || 'draft' === $post->post_status ) {
+			return $post;
+		} else {
+			return new WP_Error(
+				'rest_post_invalid_id',
+				__( 'Invalid post ID.' ),
+				array( 'status' => 404 )
+			);
+		}
+
+	}
+}

lib/compat/wordpress-6.1/rest-api.php

@@ -43,3 +43,17 @@ function gutenberg_register_gutenberg_rest_block_patterns() {
 	$block_patterns->register_routes();
 }
 add_action( 'rest_api_init', 'gutenberg_register_gutenberg_rest_block_patterns', 100 );
+
+
+
+function gutenberg_update_navigation_rest_controller( $args, $post_type ) {
+	if ( in_array( $post_type, array( 'wp_navigation' ), true ) ) {
+		// Original set in
+		// https://github.com/WordPress/wordpress-develop/blob/6cbed78c94b9d8c6a9b4c8b472b88ee0cd56528c/src/wp-includes/post.php#L528.
+		$args['rest_controller_class'] = 'Gutenberg_REST_Navigation_Controller';
+	}
+	return $args;
+}
+add_filter( 'register_post_type_args', 'gutenberg_update_navigation_rest_controller', 10, 2 );
+
+

lib/load.php

@@ -47,6 +47,7 @@ function gutenberg_is_experiment_enabled( $name ) {
 	// WordPress 6.1 compat.
 	require_once __DIR__ . '/compat/wordpress-6.1/class-gutenberg-rest-block-patterns-controller.php';
 	require_once __DIR__ . '/compat/wordpress-6.1/class-gutenberg-rest-templates-controller.php';
+	require_once __DIR__ . '/compat/wordpress-6.1/class-gutenberg-rest-navigation-controller.php';
 	require_once __DIR__ . '/compat/wordpress-6.1/rest-api.php';
 
 	// Experimental.

packages/block-library/src/navigation/edit/index.js

@@ -207,6 +207,9 @@ function Navigation( {
 		hasResolvedCanUserCreateNavigationMenu,
 	} = useNavigationMenu( ref );
 
+	const navMenuResolvedButMissing =
+		hasResolvedNavigationMenus && isNavigationMenuMissing;
+
 	// Attempt to retrieve and prioritize any existing navigation menu unless
 	// a specific ref is allocated or the user is explicitly creating a new menu. The aim is
 	// for the block to "just work" from a user perspective using existing data.
@@ -386,6 +389,7 @@ function Navigation( {
 		if ( isSelected || isInnerBlockSelected ) {
 			if (
 				ref &&
+				! navMenuResolvedButMissing &&
 				hasResolvedCanUserUpdateNavigationMenu &&
 				! canUserUpdateNavigationMenu
 			) {