Bloodmoon
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[1.12.2] No red environment caused by Optifine C7
If Optfine C 7 is present the sky is red but the environment is normal. If Optifine is not present everything works as fine as it should.
Forge: 1.12.2 - 14.23.1.2566
The sky and the moon is red, but not the blocks. It is only present if Optifine is installed.

Yeah, i don't think i can fix this due to the way Optifine is handling the lightmap now. Maybe try to play around with the Optifine Settings a bit, see if something makes it work.
I wasn't unable to find way to get it working.
If a resource pack is loaded with custom lightmap then it would overwrite the vanilla lightmap. If Bloodmoon is patching EntityRenderer.updateLightmap() then the patch may be failing when OptiFine is loaded. If Bloodmoon is using WorldProvider.getLightmapColors() then OptiFine should be complaining in the error log that something is wrong.
No information on this issue has appeared?