I loaded up my House condo and some rooms on the bottom level have the ground from outside coming up through the floor. It’s not solid, I can walk through it, but it’s there.
Also related, the ground outside on the right side of the back deck (while facing the house) is lower than the collision detection. I’m assuming it’s attempting to lower the LOD on the ground while I’m too close to it.
If it’s related, I also have a lot of canvases in my house (117 to be exact).