What happens if a "Possible Duplicate" Question is missing for a closed question.
here is the link
now under Revision List
So is this a bug on SO.
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Look carefully, at the revision history, and you'll notice that the question you mentioned was for some period of time (although now re-opened) marked as a duplicate of a question that later got deleted. If a question is deleted, unless you have 10k repuation or are a moderator, you will not be able to view the deleted question.
The question that had the question you mentioned as a duplicate is no longer deleted (it was undeleted).
This is not a bug, it is just that a question that was marked as a duplicate of another question had its question that it was marked a duplicate of deleted.
At this moment in the fabric of space time, the question you mentioned is no longer marked as a duplicate of the question that got deleted, and the question that got deleted is no longer deleted.