A question being closed hides the possible duplicate comment
64472
Manual "Possible duplicate of" comments are wrongly removed when question is closed
56823
Change how questions marked as duplicates by the asker are represented
152605
Duplicate Low Quality Post in First Post & Late Answer - Double Flag?
35162
Duplicate questions without answers
7406
When merging questions, leave the duplicate one as a placeholder
71646
Duplicates of an outdated question
22831
Changes to "close as duplicate" (part deux)
48639
Why prevent duplicate questions?
20791
Answered questions appear as unanswered on feed
84094
Change the way a closed question is marked
126330
Wrong wording of close message when question is closed as duplicate of more than one
78861
Why are there two separate boxes about duplicate questions?
44876
Answer appears automatically converted as a comment
82853
Can Community ♦ raise a duplicate content flag when an answer is deleted and re-posted as a new answer?
10674
Avoiding asking a question that's already been asked
17883
Why does the question's closed status disappear when clicking to load a new edit?
123764
Question closed because yes/no answer