If you are in Singleplayer, Optifine will remove the Anti-Mob-Spawn Feature from all GT6 Stone Blocks. You will have to use Concrete or C-Foam if you want to prevent Mob Spawns.
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If you are in Singleplayer, Optifine will remove the Anti-Mob-Spawn Feature from all GT6 Stone Blocks. You will have to use Concrete or C-Foam if you want to prevent Mob Spawns.