When starting the game with this mod enabled, I get the following error message

Failed to load mods: Error while loading recipe prototype "quench-hot-copper-plate" (recipe): In RecipePrototype, category and additional_categories got merged into categories table. Please use that instead.
Modifications: Hot Metals Quencher › Cerys › ○🌐Muluna, Moon of Nauvis

I'm not sure what exactly is causing it, but my guess would be that it's an issue with migrating from 2.0 to 2.1.

Thank you for making this mod, I really enjoyed it while it was working.