Last mob in simulacrum behind a wall not attackable

I'm in wave 15 simulacrum (Hysteriagate) and have 1 last mob stuck behind a wall and can't attack him.
Game restart or zone reload doesn't help at all.
Kinda frustrating to read that this problem is at least known for 4 years and reported multiple times and it still is a thing.
https://imgur.com/a/WZfev1L