Non related bug, when you attack from stealth all NPC adversary stay "frozen" in place, no self preservation or reaction to theirs buddies being hits 2-3 in a row.
I have noticed a couple of places where this seems worse than in previous patches, including being able to finish off about four enemies in the Zhentarim hideout without them finding me and entering combat. I wasn’t even in stealth, just on high ground. But that might just be coincidence as things like this did happen in previous patches too. I do wish enemies were more proactive about moving towards the spot attacks come from when the attacker is out of normal combat range.