Heading to Mogilevka I decided to try and drink from the pond (coordinates: 077 104) on the southern side of town. Upon leaving the pond I turned to walk pass the boulder with a broken wooden pallet and lost control of my character who was seemingly "sucked in" the pallet for a moment or two and then the boulder itself. I am unable to move from the boulder, however I can look around using the alt key. I am still able to lean, cycle through my hot bar, open inventory, cycle through the posture positions, attack, eat, and drink.

The animation is just infinitely falling through the boulder.