I have experienced on another Discourse forum that my post got flagged after resolving the issue with staff and it being archived; the flag leaded to a forum warning which I could have easily avoided as the post was already archived.
For context, I have accidentally posted in the wrong category; when I noticed it, I replied that I need this to be deleted or moved to the appropriate category. I could not delete it as deleting was locked and I couldn’t move it myself either, as the category in question was restricted to Post Approval. So a moderator then went and archived/unlisted the post, but then I got a notification about a forum warning that was the result of a flag.
So, I am asking that archived post should have flags locked, to avoid stuff like that with posts that have already been resolved by moderators.