Previously the blocks used for fallout from meteorites depended on the top-level block used by the Biome's surface builder. This is no longer available in 1.18 since the surface building is now done using complex rules attached to the chunk builder.

See TODO 1.18 comments in FalloutCopy & MeteoriteStructure.

We might need to either:

• Hard code suitable blocks per biome (bad for modded biomes)
• Use biome tags for the respective fallout types and fall back to NONE if none matches