Alternative Mobs Chickens Works, But Not Cows? (Optifine)
Hm. I made a mostly-clean install of Minecraft (because that didn't work) and just copied over my resourcepacks, logs, saves, and servers. Tried booting it up and then installing just Optifine and it still isn't working. For reference, everyone on the Vox server has the Vox pack and no one else is having problems but me, so it's definitely something to do with Fabric/Optifabric and the BDcraft resource pack conflicting.