When using Optifine with Shaders enabled, somehow modded biomes will be cleared from the WorlGenRegistry leading to crashes, log spam and missing biomes. My mod Vampirism crashes on world creation ...
Certain mobs are randomly invisible and invincible. I can hear them and I take damage from them, but I can’t see them or kill them. This problem appeared only after I downloaded Optifine version 16.2 ...