fix: preserve return url in submenus

src/Menu/AdminMenuBuilder.php

@@ -259,8 +259,10 @@ class AdminMenuBuilder extends AbstractMenuBuilder
 
         $this->addDivider($menu);
 
+        $request = $this->requestStack->getMainRequest();
+
         $menu->addChild('zurück zur Übersicht', [
-            'uri' => $options['return_url'],
+            'uri' => $request->get('r'),
             'extras' => [
                 'icon' => 'arrow-left',
             ],