Re: [FIXED] Open staircase cause routing failures
I also have this issue. I have tried the workaround reported by @JuliaChang93, and while it makes the stair usable, it is not a perfect workaround in some situations. It seems to work around the issue by making the opening in the floor count like the outside/not a room. This has side effects such as the one in the attached picture - the pillar can no longer be placed on the building's outer corner, because the corner no longer counts as the corner of a room.