Encountered this today, really stupid, had it with an alpha vulture, tried to lure away several times, was attacking storage boxes through a stone ceiling, would fly away then come back and repeat that whole process over and over again, there were no bodies inside the house either, Just another annoying bug I guess we'll just have to deal with till the devs can actually fix it, :(
We also weren't able to kill it at all, my buddy shot it with a gun several times, and it just started regaining health off nothing instantly, back up to full hp, literally unkillable,