I locked myself in a building (specifically the half circle roof barracks building in military zones, has 1 door, 1 small square window). Wolves became active in the area, eventually they aggroed on me, initially just their heads were clipping through the wall not causing me any damage even though i was against the wall. Then they clipped through the wall and began attacking me inside the building, no door open, no way for them to get in. Also in relation to this, after skinning & gutting the wolves, everything went through the floor, steaks, guts, etc