[MC-128658] Nether and end biomes don't use correct blocks in buffet world type

Using buffet world type with nether and end biomes generates with stone instead of their correct blocks: netherrack, magma, soul sand, and end stone.

Updated to 20w06a

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This same error happens when using overworld generation, in that case it can even generate with water.

Same with End biome, with Overworld / The End generation

New title and description: Dimension Biomes generate stone in the Buffet World Type

The End biomes and Nether biomes don't use their special stones (Netherrack, End Stone), and instead use normal stone.

This destroys some types of "Sky Dimension" maps.

Also select overworld and type void. You just get flat stone.

Maybe when you use The Void biome it thinks your'e in superflat?

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Definitely not fixed as of 1.15-pre7, this resolution seems to be completely wrong. Should this be reopened or should I just make a separate ticket?

I can affirm that it still occurs

Still affects 20w06a.

List of affected biomes:
nether_wastes
soul_sand_valley
crimson_forest
warped_forest
the_end
end_barrens
end_highlands
small_end_islands
end_midlands

This is fixed in 20w21a

Requesting reopen still affects 1.16.4 pre-release 1