Single biome, caves and floating islands world generation has stone as its primary block and water as a primary fluid regardless of the biome.
How to reproduce: create a world with any of these world types and select a nether or an end biome. [X] The primary block is stone and primary liquid is water
Expected results: stone and water generate in overworld biomes, netherrack and lava in nether biomes and endstone in end biomes.
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This is likely to be intentional - all the default custom world options are limited to the basic overworld spawning code, if you want more detailed control, use custom .json files.
I agree with [Mod] Galaxy_2Alex, this is likely intentional as it mirrors Buffet world behavior from 1.13-1.15.2.
Duplicate of MC-184613/MC-184793/MC-184644