multiple selection not working in search filter


I have created a multiple dropdown selection for department.
However, I noticed that when using a search filter, it seems not to be working.

If no department is selected, all users are on the list.
But once I selected a department, there is no result.

FYI the user have multiple departments… department a, b and c.

I tried to select all department, or even one department only but still no luck.

Am I missing something or is this a bug?

This is now working.