BUGFIX updating existing managed filters fails (#56631)

lib/ansible/modules/remote_management/manageiq/manageiq_group.py

@@ -440,6 +440,7 @@ class ManageIQgroup(object):
         norm_current_filters = self.manageiq_filters_to_sorted_dict(current_filters)
 
         if norm_current_filters == norm_managed_filters:
+            if 'managed' in current_filters:
                 new_filters_resource['managed'] = current_filters['managed']
         else:
             if managed_filters_merge_mode == 'merge':