@BryonyRaeAs you can see in the video, the problem is not with the terrain, but yes when the stair has only one degree. Put a room, leave the foundation low and place the stair.
EDIT: I've tested in Potters Splay and I can reproduce this.
Potters Splay:
@leozabotto Thanks for the videos. That was indeed how I tested in my game, but going back into it now, I can reproduce this glitch on Potters Splay as well as others, so not sure why it didn't happen the first time I tested there. It may be that it does not always occur (but is not lot related). It definitely seems to be easily reproducible on the whole though, so yes, I think it deserves its own separate thread.
