If you set in Multi Noise the same parameters for 2 biomes, one of them generates, but the second one will never generate.
Set all parameters on biome 1 to 0.
Set all parameters on biome 2 also to 0
Import it to a new MC world.
→❌ One of the biomes generates, but the second one will never generate
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I don't think this is a bug. Multi-noise doesn't ever pick a value for any parameter above or below +-2, so if it has 256 it won't generate at all.
Here it is. You'll see that plains biome generates, but the giant tree taiga does not generate at all.
Please provide the .json file used in your example.