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It's not new, it depends on the mod. I know that mprep adds a note to explain the merge of posts (we can't properly merge 2 posts/topics, that's why some mods edit the first post and delete the second one), I do that kind of thing too. The best thing to do is to avoid double posts.
I see. Thanks for the clarifying and Yes, it was mprep.
IIRC, we were testing the telegram bot if he'll get two separate notifications for a post quote and a "@" mention that time.
So it's not just on merged posts. It was probably the same mod who checked our post