Optifine messing up BOP's Loamy Grass block biome coloring, need to somehow disable loamy grass and dirt generation

[BBoldt]

Minecraft version:

Unabridged or Abridged version:
3.18.3
Issue Description:
My first thought was to disable loamy grass and dirt from generation entirely, I tried using biometweaker to accomplish this but it seems like the one thing it has issues with in 1.7 is editing the top layers in biomesoplenty biomes.

It sounds like it would be an easy fix but it is not.

Currently the only way to get rid of the bug is to just remove optifine.

Images:

Crash report or log (uploaded to gist.github.com or pastebin.com):

[maggi373]

since optifine is not included in the pack, i would not spend time on it. Its an minor bug anyway

[BBoldt]

Optifine is included in the pack, it's a linked download on ATLauncher. The pack also includes a set of custom skies that work with optifine. I'll decide what issues I'd like to spend time on thanks.