will be fixed on the next update, I cant confirm the bug about not being able to attack some of them however, did some testing and it worked fine for me.
Still have the same issue with attacking some of Ambushas! Sometimes you can attack them but sometimes you cant...i dont know whats going on! Its too random.
Do they take damage from untargeted AOE?
Edit: nvm, i just read what you wrote up there.
Iirc one of the patches in the last months fixed many of these NPCs: maybe some remnants.
They bug for some seconds...if you move and try to attack them again you might succeed.
Added 10 more previously missing ambushas to the PQ.
There are 46 Ambushas around, enough to do it fast.