Affects Version/s: 20w20b
Fix Version/s: None
Grass can spawn on magma and netherack at ruined portals.
What I expected to happen was...:
Grass should not be able to spawn on magma or netherack.
What actually happened was...:
Grass spawned on magma and netherack when creating new worlds.
Steps to Reproduce:
1. Create new world
2. Find ruined portal in overworld
3. Grass has a chance to spawn on magma or netherack