Hi Jerome,
Are you sure that it is happening only after you added the hidden attribute in the filter?
You can check if the search returns any result in the normal scenario when the hidden filter is not added.
- In that case, check if your user has been given the appropriate right in the ACE.It might be no access now.
- Also check if the corresponding ACE Work package - Usergroups,rights have been activated.
Thanks & Best Regards,
Leon