Ticket #45677: 45677.11.diff

src/wp-includes/class-wp-post-type.php

@@ -704 +704 @@
          *                                 is set not to show in rest.
          */
         public function get_rest_controller() {
+                if ( $this->rest_controller ) {
+                        return $this->rest_controller;
+                }
+
                 if ( ! $this->show_in_rest ) {
                         return null;
                 }

src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php

@@ -15 +15 @@
  * @see WP_REST_Controller
  */
 class WP_REST_Posts_Controller extends WP_REST_Controller {
-
-        /**
-         * Instances of post type controllers keyed by post type.
-         *
-         * @since 5.3.0
-         * @var WP_REST_Controller[]
-         */
-        private static $post_type_controllers = array();
-
         /**
          * Post type.
          *