I have noticed this same kind of behavior with the physics. The movement physics for walking / tail / clothes and so on go from [Full] to [Simple]. I also find this can happen in other dungeons as well, another factor I think is the camera distance from Player Character.

When I have the camera distance in default distance (from pressing End on keyboard or Ctrl+Shift+End if you have changed it) this bug does not seem to happen. While if I fully zoom out or almost full zoom out, at some point in the dungeon the movement physics drop from [Full] to [Simple] with the actual setting remaining unchanged as [Full].