theres a robotics disposal yard near sanctuary
i activated the prototype sentry robot there.
his visor lights up, he says a couple things about protecting the military etc..... and then just sits there doing nothing.
i blasted him about 20 times with a shotgun and he did nothing at all, didnt even move, until he exploded.
then lots of molerats appeared from nowhere and i killed those.
area doesnt say 'cleared' on the map.
BUG!!