The biome still doesn't load the colors though, which is the main issue. I'm not sure where I've gone wrong, or if I have.
A buddy of mine tried running the datapack, the Dagobah biome specifically, and it wouldn't even generate for him, it crashed and he got an error Received invalid biome id: -1. It loaded for me but none of the colors loaded.
The biome still doesn't load the colors though, which is the main issue. I'm not sure where I've gone wrong, or if I have.