The field is "Responsible QA", but I'm going to guess that it's not on your "create issue" screen. You might want to try the "where's my field?" option in the configure fields option to the top right to find out why it's not there.
My guess on the cause of the issue is that configuration of the field is
- It is mandatory
- As a user-picker, it has been limited to selecting from a group or role
- It has a default set (Let's say the default is the user "Charlie" who is in the group "this-projects-QA-people")
And the system change that has occurred is either
Charlie has been removed from the this-projects-QA-people group
- Charlie has been de-activated
- Charlie has been completely deleted
- Because Charlie is no longer a valid selection for that field, the default is read, not found, and hence seen as "unassigned"
You'll need to
- Undo the changes to Charlie's account
- Reconfigure the field as optional
- Add the field to your screen so the users can choose someone
- Change the default for the field to someone else
(The last one is probably the right answer, but the others are valid and might be better for you)
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