Ok, so it says that MC-10 is fixed, but it's not.To Reprodouse:Put 765 chickens in a pen with 1 block too move around. They Will glitch and go back in.
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Can't reproduce. I got only real permanent glitched out mobs (I think because of lag, lot's of collisions and not accurate execute and summon).

works fine for me too, and don't create duplicate tickets on purpose, just leave a comment at the existing report