Thermal Foundation covers render black when using (internal) shaders

[shinji257]

When using the (internal) shaders from Optifine the covers are rendering black in that scenario. They render fine when a shader pack is used as well as when shaders are off though.'

Pack test: FTB Revelations (ignore the sky or add dim 0 to astral sorcery to weakSkyRenders list)
Optifine HD F6_pre1 Ultra (fixes shaders crash)