Amusingly, the question Is there a subfield F of the complex field with [C:F]=3?, which was closed as a duplicate, has two "Possible Duplicate" boxes, each indicating the same question as the possible duplicate (namely, What is the condition for a field to make the degree of its algebraic closure over it infinite?). Is this a bug of some sort? Obviously it's not a pressing matter, but I thought it should be brought to someone's attention.
Might have been a duplicate action taken during a deployment which caused a race condition on close.
Anyway, all that is needed is to edit the post, which I did.