Difference between URI and URL has been merged, but also shows "Possible Duplicate" within the question text.
I went to edit out the in-question duplicate. But pressing the edit button shows the error:
Suggested edit queue is full
The post is locked, as well as merged. When I attempt to edit a non-merged locked question, the much better error text is given:
Post is locked.
I have edit privileges on SO, so I don't believe the Suggested Edit Queue should be involved in this process at all. So I'm assuming it's a bad error message, not the fact that the queue is actually full or that my edit would be queued.
Post is locked.
So either someone fixed this really quickly, or it is actually somewhat (incorrectly?) tied to the Suggested Edit Queue. – pkamb Sep 3 '20 at 18:03