I used to think that, when I'm not the author of a post, I'll only receive a inbox message as a reminder for a comment if I've commented under the post and another commenter under the post adds a @xzczd in his comment, but recently I found there seems to be some exceptions, for example, I received a reminder for this comment, no "@" therein.
So in what cases will I receive the reminder for a comment? This seems not to be explained in the helper center, I believe it has been explained somewhere else but failed to find it.