fix: preserve return url in submenus

src/Menu/AbstractMenuBuilder.php

@@ -28,7 +28,12 @@ abstract class AbstractMenuBuilder
 
     protected function getDefaultRouteParameters(string $parameter = 'id', string $default = '0'): array
     {
-        return [$parameter => $this->requestStack->getMainRequest()->get($parameter, $default)];
+        $request = $this->requestStack->getMainRequest();
+
+        return [
+            $parameter => $request->get($parameter, $default),
+            'r' => $request->get('r'),
+        ];
     }
 
     protected function addAdminItem(ItemInterface $menu): void