I've noticed any colormaps in my pack that aren't grass or leaves (water, sky, birch, etc) aren't matching up with the new 1.18 biome ids, and instead are still using the 1.17 ids.

To be fair, they did remove a ton of biomes from the game so it was kinda necessary to change it i feel

This is intentional so that resource packs do not need to shuffle columns. Did Optifine just decide to go full breakage?

yeah optifine switched to the 1.18 ids so unfortunately packs won’t be compatible with both mods. IMO if you’re gonna keep optifine’s format i think you should update to the new ids, even if it means people will have to update their packs. Just my opinion though :)

That's annoying. I kind of hoped Optifine would also use the 1.17 columns, but maybe I expected too much

Just wondering are you going to make the mod use the new 1.18 IDs? I would like to know if I should fix my packs or not

The next update will use the raw IDs for vanilla biomes in the current version by default (same as Optifine), but you will be able to set layout = legacy to use the old 1.17 IDs (including using the 1.17 equivalent datapack biome IDs in Optifine style packs), or layout = stable to use the 1.18 columns with the guarantee that they will never change in the future

Nice, glad you found a way to use both options aswell