I havent done full testing on this but here is the scenario
create L-shaped spine staircase,
with 'Edit Stair' dialog still open,
use interact tool to change orientation,
change something in 'Edit Stair' dialog and 'Submit'
the staircase resets orientation .
This also happens after closing the dialog, and then re-selecting, and 'Edit Stair'
PlusSpec is awesome !