Update any field post-function not working for assignee

[Stacy Haller]

Hello -

I was copying an existing workflow where it automatically assigns the ticket to our Product Owner when the ticket is transitioned to the PO Sign/Off status.

The copy is for a different Product Owner, so I tried to edit the existing "Update Issue Field" post-function.  When I try to add the new user, it won't accept the name, jira id and the Select a User isn't working either.

I was able to update this same workflow on our test Jira instance recently, but it might have been before our most recent update - I can't be sure when I made the update on test.  We updated from 8.20.5 to 8.22.2 on 4/21/22.  

Has anyone else run across this?