I understand the general rationale for wanting to close questions as duplicate with at least one answer. I also understand the general rationale for wanting to close a question as a duplicate that someone reposted.
But I can't understand why the duplicate label should persist if the linked duplicate is removed for one reason or another. This doesn't create a nice navigable flow for someone looking for an answer, and is led to believe that their answer is in another question.
Here's an example. The question itself can be salvaged, but why it's closed as a dupe when the dupe no longer exists is a bit weird, from a user that doesn't have access to the 10K tools.