I found a game-losing bug when using Doppelgang to make 9 copies of a Royal role. But I only had 5 creatures available, so I couldn’t select 9 creatures for the 9 copies. This made it impossible to proceed using the game UI, and I had to wait for a timeout.

The game recovered, but was very slow and I lost or drew a game I should have won. If I can’t make lots of copies with Doppelgang without losing the game, at least warn me.