Heya,

currently it looks like the campfire tile entity looks specifically for FluidRegistry.WATER when trying to extinguish it with a bucket.
This is a bit of a rare case, but in my case im not using the vanilla water anywhere, instead i use the betweenlands swamp water.

Would it be possible to get a config option or something that could specify what fluid is valid there?

Cheers,
SC

Sure. I can add it to 1.12.2-1.6. It should probably be extended to all things extinguishable: campfires, torches, and combustion machines.