When you enter a the room at the upper floor in the building at Äpplarbo (-3802, -360) you fall thru the floor down to the entrance level.
Just got there.
Not only we fall through the floor but also it is possible to jump through the roof from the table on the right:
Still there, just dropped there. It is actually multiple spots in that room.
This has been acknowledged in a more recent thread. For now, beware Äppelbo. It is a silly place.