This appears to be a universal issue in Legendary Edition's ME2/ME3 with how enemies stand up after getting knocked over.
See this other thread about a related issue where enemies knocked over by Cryo Ammo do not get up on their own.
@DocTheGamer I see. You are right. I simply not noticed in ME2, because I killed them before the bug is triggered. I also captured some footage about Cannibals too. This is just sad, it's not a little bug, this is effects combat difficulty and overall gameplay experience. I can trigger this in every 5 minutes with my biotic Shepard. Enemies behavior should not work like that... 60$ game experience... it's just a bad joke.
Had it happen occasionally in Mass Effect 2, but as I started Mass Effect 3 it became quite common during the Mars mission.
@Schachmatt123Yeah. It's happens very often. I can't finish a mission with adept, without at least 3 broken enemy.
