Slay the Spire
Downfall Expansion Mod - 4.1 ft. the Hermit
Bug: Gemstone Gun + Sealed Deck conflict
I started a custom game with Sealed Deck and Heirloom. Heirloom got me a Gemstone Gun at the start of the game, and offered me the gems as usual. However, it didn't let me choose the cards for my deck, so I (predictably) died on the first floor since I didn't have any skills or attacks.