I think many people know this already, an aggroed roach will run away and social pull nearby other mobs. You notice this mainly in RFD, DMN & U/LBRS.
I just want to get confirmation if this is an intended behaviour since among all the critters in the game it’s only roaches that will do this, so it pretty much feels like a bug (and I don’t remember roaches doing that back in vanilla).
I personally never died from it since I know about it, but I don’t think new players will be happy when they die to an invisible mechanic, some might not even understand what pulled the pack that killed them.
This never gets talked about in Q&As or bug talks. I would’ve committed this question for the Blizzcon Q&A, but for some reason only the US Forums have an official Q&A threat, so if you don’t have an US account you won’t be able to post any questions.
I don’t recall it being a thing back then either and it does not really make any sense for it to work like that.
So I just assume it is just current Blizz quality in play here.