Promising Stairs did not count the rooms appropriately during my upkeep, delaying the game by an additional turn.
I had the following unlocked rooms.
Grand Entryway, Elegant Rotunda, Surgical Suite, Moldering Gym, Defiled Crypt, Cadaver Lab, Central Elevator, and Promising Stairs. These were all unlocked before my upkeep. The game only accounted for 7 differently named unlocked rooms.
I continued my turn and played Greenhouse as an additional room, bringing the total to 9 different named rooms.
During my following upkeep, with 9 rooms unlocked, the game only accounted for 8 of them.
This was in a Brawl match. I can only assume that the game may not be counting some of the Alchemy cards. I don't believe that any of them are from the Alchemy set from Memory or the the game itself is showing. Maybe Surgical Sweet?
Either way, the count is off and could potentially lose games when not triggering correctly during upkeep and showing the correct number of unlocked rooms.
The screen shot will show that only 8 rooms are accounted for, but there are 9 unlocked rooms that you can see on the board.