Some preface: I have an alternate account that I'm using to gain rep in order to help test/build bots for the SOBotics community on stackoverflow. Bot accounts are essentially users, and they need 20 rep to talk in chat, and 50 in order to add comments.
On this account (with 23 rep), I flagged a question as a duplicate of the wrong post by accident:
When I retracted the duplicate flag, I noticed that the comment was not removed. When I attempted to remove it, there was no [x] icon to the right of the post, and I had no recourse other than to leave the comment up (Which was 100% a wrong duplicate for that post). Additionally, I couldn't even flag it for mod attention, because it was my comment!