Server crashes when loading a dimension with custom biome

Please make sure there's no feature cycles in your data pack setup. Feel free to join third-party communities like Minecraft Commands for further assistance.

_{Minecraft Commands is a third party community Discord server for discussing data pack-related stuff and is not endorsed by the bug tracker blah blah blah}

How the hell do I take away the feature cycles????

This is a bug tracker so it's not the best platform to work on data pack issues. As I mentioned earlier, feel free to join other communities for assistance as they have more proper tools to help you.