Bug Report

What's the issue you encountered?

ocean biomes generates in the nether, creating water spots in the lava (creating obsidian around it), and "overworld" mobs to spawn. (found fishes, and OW hostile mobs on solid blocs)

How can the issue be reproduced?

create a new world, go in the nether, and find a large lava biome (the old nether one i think)

Logs

can't post my debug.log on Pastebin, because of a logspam of this error :
[07oct.2020 19:38:04.410] [Worker-Main-19/WARN] [net.minecraft.world.gen.layer.Layer/]: Unknown biome id:

can't attach it to the report, file size is 173MB, due to the 1.5mil+ lines du to logspam.

they can't help, but i attach some screenshots at the end of the post.

Mod Version

mod version : 12.0.0.404
forge version : 34.1.11

This is an issue caused by OptiFine, and is affecting all biome mods. It's also been speculated to be caused by CraftPresence and potentially other mods as well.

i don't use Optifine, but i have CraftPresence, so it can be the cause. i should try without craftpresence, and see if it still happening.

edit : okay, a similar report is posted on CraftPresence's GitLab, and tagged as "confirmed" 2hours ago, so it's 100% their fault.

thanks for your support/replys.