Roof model doesn't update properly while in Possession

While mining out tiles in Possession, roof above freshly mined out tiles shows visual glitches as it appears to not remove the old connection to a wall that is no longer there. Exiting possession or claiming the tiles fixes any bugged tiles.

Steps for reproduction:

1. Turn up the gamma a bit, to make this easier to see
2. Start a new sandbox
3. Place a worker impass against one wall (to prevent other workers from claiming behind you)
4. Possess a worker
5. Mine out a new room without claiming the floor. The issue is most obvious at 3x3 or larger
6. Look up