Lua bug when trying to make staircase

Reproducable. This is in design mode before building occurs.

Make a square foundation 42 by 42. Make a 3 by 3 staircase. Enclose top of second floor. Put individual blocks by staircase gives this error.

release-453 (x64)
…hearth/services/server/build/build_undo_manager.luac:6: assertion failed!
stack traceback:
[C]: ?
[C]: in function ‘assert’
…hearth/services/server/build/build_undo_manager.luac:6: in function 'begin_transaction’
stonehearth/services/server/build/build_service.luac:300: in function 'do_command’
stonehearth/services/server/build/build_service.luac:50: in function <stonehearth/services/server/build/build_service.luac:49>

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Not sure exactly how you’re doing it, but I had an issue adding floating slab blocks in a custom building. The only workaround I found was to complete the building, then add the blocks later. They don’t seem to like building floating slabs unless it is done very carefully and very simply. haha

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