Pebbles and Twigs Only Spawn Underwater Now

Versions: Minecraft: 1.20.1 Forge: 47.3.4 NatProg: 2.3.8

Logs: https://gist.github.com/CraftyZombie/9421a63acb2cf36d08ef30413d7bb286

Config: Unaltered.

Description: I've noticed that in 2.3.8 (I don't remember about 2.3.7), pebbles and twigs will only spawn underwater. I've checked everywhere for them. The rest of the world is completely barren. Downgrading to 2.3.6 makes pebbles spawn elsewhere again. There's no way it's a coincidence, but I don't know the cause of it either.