Turns out the problem may simply be that you can't interact with anything below floor 0. I later realized that you can't interact with the rooms at all once they bug out. And I seem to be able to reliably reproduce the bug by placing a hallway on floor -1 or -2. I tried floor 1 and it was fine.
Drift_91
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A member registered Feb 22, 2020
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There seems to be an issue with elevators. When I place an elevator, and then place another, the second one isn't able to be deleted. It even persists if I save and reload then try to delete the second elevator. Only way I've found around it is to place the first elevator then save, restart and load before placing the second. I hope these details help.