Players are able to glitch through the walls in the prison buildings, such as the one in NEAF. Players are able to shoot through the walls from rooms that you can't enter into the rest of the building to kill players without them ever seeing them or being able to shoot back.

The guy who just did it to me was in the top floor in the room at the end of the hall which you can't normally enter, my friend was able to see him by going into 3rd person and leaning towards the wall upstairs to glitch his camera through the texture of the wall

I have been in a similar room once due to a massive desync inside a building, but have no idea how to replicate getting in there

Edit: A guy later logged in while my friends were still there in the stand off on the ground floor this time. In a similar "room" that is not normally enterable. This 3rd guy was able to enter and leave that room via the rear of the building through the wall. No screen shot on that unfortunately as my friends were too busy being shot by these invisible people {F30673}