This is a really annoying bug that has to do with world gen so I thought I'd ask, is it possible for you to fix this bug: MC-194811 ? Am not sure what you will need to do to fix this but if you could take a look i'd appreciate it. Cheers!

I'd heard of this before, however I was under the impression it was already fixed by Forge - but that may not be the case (?). Or it may just be sitting in a PR getting stale.

Fabric API had fixed this a while ago although.

Edit:
This is currently PR'd to Forge in MinecraftForge/MinecraftForge#7471. If for some reason is it not possible to fix it in Forge itself, I would consider implementing the same fix into Chocolate.

This has now been fixed in Forge, as of 1.16.4-35.0.22, and as such is not needed by Chocolate.