Ticket #17447: 17447.2.2.diff

wp-includes/post-functions.php

@@ -991 +991 @@
         // Sanitize post type name
         $post_type = sanitize_key( $post_type );
 
-        if ( empty( $args['_builtin'] ) ) {
-                /**
-                 * Filter the arguments for registering a post type.
-                 *
-                 * Not available for built-in post types.
-                 *
-                 * @since 4.4.0
-                 *
-                 * @param array|string $args      Array or string of arguments for registering a post type.
-                 * @param string       $post_type Post type key.
-                 */
-                $args = apply_filters( 'register_post_type_args', $args, $post_type );
-        }
+        /**
+         * Filter the arguments for registering a post type.
+         *
+         * Not available for built-in post types.
+         *
+         * @since 4.4.0
+         *
+         * @param array|string $args      Array or string of arguments for registering a post type.
+         * @param string       $post_type Post type key.
+         */
+        $args = apply_filters( 'register_post_type_args', $args, $post_type );
 
         // Args prefixed with an underscore are reserved for internal use.
         $defaults = array(