Strange NPC dialog bug

Gamer1986PAN

I am not sure if this bug is already reported and the video i made is german, but it should be clear what the problem is here: (the NPC i am talking to is not moving its lips, but the NPC right behind the NPC i am talking to is taking over the mimic instead) a kind of reverse ventriloquism...

https://youtu.be/0NLX0sSBoxI