Excited to see the new Fiasco Card game coming to Roll20, but adding the add-on card decks will overwrite the existing elements in the game. It appears the creators didn't create entirely new handouts and decks when creating the add-ons, and instead just change the content of the existing ones. So, the add-on handouts and decks are the same ID as the existing ones, thus overwriting them instead of adding new content. Hope to see this fixed with proper, unique assets soon.