Sequence of events:

  • I started the process of closing a question as a dupe.
  • The system adds the "Possible duplicate of..." comment on my behalf.
  • Somebody adds a comment, tagging me.
  • I respond with an additional comment.
  • The question finally gets closed, due to other people's votes.
  • The "possible duplicate" comment gets automatically deleted and the additional comment I made too!

At least this is what seems to have happened on this specific question: SMD diode part number from marking code. My additional comment has been restored by a diamond moderator after I asked why it could have been deleted (see chat log), but it has been missing between the time the question has been finally closed, and the time I asked for clarification on the moderator chat.

I don't think this is expected behavior. Shouldn't the system only delete the "possible duplicate" comment it added automatically, but not those I made myself afterwards?

(Or maybe I am entirely mistaken and the delete was not even due to the "possible duplicate" comment mechanism at all?)

  • Not really a bug. To be on the safe side, the dupe mechanism deletes any comment with the word "duplicate" and link to any question when the question is closed. Commented Jul 24, 2018 at 11:14
  • 1
    @ShadowWizard OK, I understand I just had bad luck there. My comment had the word "duplicate", and linked to another post, although I wasn't pointing a dupe to the original post at all. But the heuristic seems strange anyway. I just feel like the system is removing useful information.
    – dim
    Commented Jul 24, 2018 at 11:22
  • 2
    Well, ideal solution is to mark auto comments as such behind the scenes (another db table column?), then delete only the auto comments, and leave any other comment alone. Commented Jul 24, 2018 at 11:40
  • @ShadowWizard I agree this would be much cleaner, and would also solve most of the problems mentioned in the post you proposed as a dupe. Not sure about the difficulty of implementing this on SO side, though. I bet they'd prefer spending that time on other features/fixes.
    – dim
    Commented Jul 24, 2018 at 11:49


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