They aren’t stairs. they are wall -> ceiling sequences with diagonal support beams under each ceiling connect to it’s supporting wall. You can lay stairs on top of them though.
Edit: here’s a front view from an earlier iteration:
The diagonal support beam causes connected ceilings to inherit their stability from their supporting wall or foundation. But when the server reloads it it reduces the stability, but not as much as if the diagonal support beams didin’t exist. Or at least, not always. It’s just inconsistent.
Falsely labeled stairs? well kinda. I was looking at the pictures themselves tbh.
Giant steps maybe 