If you generate a nether with the height / generation limit set above 128, none of the biome blocks / other parts get applied, except the basalt deltas, but the basalt deltas aren't 3d biomes iirc
[media]This is a worldgen settings file, you can add it when generating a world by clicking
More World Options > Import Settings
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Added a worldgen settings file, you can add it when generating a world by clicking
More World Options > Import Settings
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We're tracking this issue in MC-187716, so this ticket is being resolved and linked as a duplicate.
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Please include the data pack used