Protected Content - Bulk Add membership to Media doesn't work

Protected Content > Protected Content > Media Library Items

Select some items from the list

in Bulk Actions drop down select Add Membership > Add Shaar HaBitachon

Click Apply => items show membership to Shaar HaBitachon

Refresh page, or filter items in any way (search, protected, unprotected) => selected items no longer show protection.

Manually protecting each item works

Bulk Actions do not work for any of my memberships

Bulk Drop does not work either

Admin Access has been granted