Differences in the Mod Between Minecraft Versions Compatibilities NOT Ported to 1.21.1 Coal Coke Dust Six Way Gearbox - Create Utilities hasn't updated to Minecraft 1.21.1 Ad Astra and CSnR - These mods haven't updated to Minecraft 1.21.1 Fuels from other mods working in CDG - Needs fixes on CDG's side