You can still get a deal (and it's still guaranteed if you never take red heart damage) but Missing Hud 2 shows 0%.
I'm assuming the problem is that you can only get a deal on the first floor if you have Curse of the Labyrinth, and Missing Hud 2 assumes that if you have Curse of the Maze you don't have Curse of the Labyrinth. But what do I know
Thank you for reporting this, I actually came across this the other day as well and can confirm. I'm not 100% sure what is causing it right now but I will look into it when I have time.
You can still get a deal (and it's still guaranteed if you never take red heart damage) but Missing Hud 2 shows 0%.
I'm assuming the problem is that you can only get a deal on the first floor if you have Curse of the Labyrinth, and Missing Hud 2 assumes that if you have Curse of the Maze you don't have Curse of the Labyrinth. But what do I know