Ticket #38499: alt-38499.diff

src/wp-admin/js/customize-nav-menus.js

@@ -596 +596 @@
                                 $content = container.find( '.available-menu-items-list' );
                                 itemTemplate = wp.template( 'available-menu-item' );
                                 $content.prepend( itemTemplate( availableItem.attributes ) );
+                                $content.find( '.menu-item-handle' ).first().addClass( 'item-added' );
                                 $content.scrollTop();
 
                                 // Reset the create content form.