Issue #3249692: Support group_content_menu module

menu_admin_per_menu.module

@@ -108,6 +108,10 @@ function menu_admin_per_menu_filter_parent_options(AccountInterface $account, ar
 
   foreach ($options as $key => $option) {
     [$menu] = explode(':', $key, 2);
+    // Add support for group_menu_content module.
+    if (str_starts_with($menu, 'group_menu_link_content-')) {
+      continue;
+    }
     if (!in_array($menu, $allowed_menus)) {
       unset($options[$key]);
     }