I was just reviewing in the close votes section of /review when I came across a question that I believed was correctly marked as a duplicate by previous reviewers. However, when I tried to vote to close it as a duplicate I received:
This closure would result in the 'duplicate of' navigation only leading in a circle
(lets called the linked post "post A") Post A already has 3 close votes marking it as a duplicate of post B, which has already been closed as a duplicate of post A. Now I was unable to complete process of submitting the close vote (because of the error of course) but I have a couple of questions about this.
How should this be handled, when something like this happens should the posts be merged?
Were the previous 3 close votes on post A allowed because they occurred before post B was closed as a duplicate of A? (this seems pretty obvious but I just want to know for my own selfish reasons!)
I tried looking into this error but it turns out that this message is hilariously under discussed. Google results