Ticket #35362: 35362.1.diff

src/wp-includes/class-wp-customize-nav-menus.php

@@ -867 +867 @@
                                 ||
                                 ( ! empty( $args['menu'] ) && ( is_numeric( $args['menu'] ) || is_object( $args['menu'] ) ) )
                         )
+                        &&
+                        (
+                                ! empty( $args['container'] )
+                                ||
+                                '<' === substr( $args['items_wrap'], 0, 1 )
+                        )
                 );
                 $args['can_partial_refresh'] = $can_partial_refresh;