A pack that can reproduce this is linked here: https://www.planetminecraft.com/texture-pack/incendium-s-optionnal-resourcepack-remix/
In overworld biomes and vanilla nether biomes, the lava should be orange, but instead it is purple-white, the greyscaled texture for the lava to be colormapped.

Have the same issue.
I tried making my own texture pack and it seems that no matter if I make it for optifine or using Colormatic's guides, the colormap just doesn't load.
I thought that maybe it's sodium interrupting but the problem stays after removing sodium.

Very excited for this next release <3