Try to remove an user from a project, shows that it worked but in fact it didn't.
This is more likely something in pagure itself. To investigate.
Metadata Update from @pingou: - Issue tagged with: src.fp.o
Ok this was indeed a bug in pagure (someone a viewonly relationship doesn't allow update, surprising right?)
Fixed in pagure in https://pagure.io/pagure/pull-request/2488
Hotfixed in stg, not in prod
Metadata Update from @pingou: - Issue assigned to pingou
PR merged upstream and hotfix in prod as well now.
Closing as Fixed
Metadata Update from @pingou: - Issue close_status updated to: Fixed
Confirmed that it is fixed.