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Today I just got a critic comment on my answer by a user whose Rep is only 1. Having 1 rep doesn't allow a user to comment.
What was this then a bug?
Nope it isn't a bug. It was a comment by the user posted incorrectly as an answer, mostly because of lack of privilege to comment.
So I choose to convert it into a comment, using the moderator tools, on your post instead of deleting it.