Automatic “possible duplicate” comment is not made, if presumed duplicate is linked in a deleted comment
8310
'Possible duplicate' comment not appearing for questions with deleted comments containing the link
70074
How to handle a deliberate duplicate question
22831
Changes to "close as duplicate" (part deux)
106409
Don't automatically clear the possible comment abuse flags when a post is deleted by the owner
38594
Don't automatically edit the post to insert "possible duplicate" links
43030
Can non-10k users see comments left on their deleted content?
67421
Do moderators see the previous versions of edited comments?
10299
Circular duplicates in the close review queue?
113721
Why comment reply auto-completion feature (@) sometimes doesn't work?
82191
What happened to the link to the duplicate when a question is closed as a duplicate?
44392
Questions closed as duplicates should include a link to the original question
158881
Edited answer converted to a comment produces "no edit history found for this comment" message
11221
Link comment flags in the flag history page to the flagged comment, if it still exists
20899
Linked and Related sections contain duplicate links to questions
105704
Question closed as duplicate with  and also shown as "Possible duplicate"
14839
Do not delete good duplicates!
33752
Why is there a comment in my inbox that doesn't exist?