Thralls walked in to the foundations and died

I had a thrall that followed me and one as I moved bit by bit to get to my new bass, when I get ther and walked up the stairs to the entrance, that thrall I had on the folow whent into the foundation and died

I’ve had the same happen. I’ve build my house on slightly elevated foundations, half-way up. Whenever a Thrall follows me there, he or she clips through the floor and keeps walking on the actual ground, as if swimming through the foundations. They can stand on stairs and top floors though.

Then one day day I heard a grunt behind a wall, and the thrall disappeared. The Event Log showed “Archer II” and an empty “Killed By” column.