Biome-specific structures generate at wrong biomes in superflat

The bug

Biome-specific structures can spawn on other biomes other than their respective biome in superflat worlds.

How to reproduce

Try reproducing by using the "Overworld" superflat preset but before generating, change the biome ID from 1 (Plains) to 40 (The End - Floating Islands).

minecraft:bedrock,59*minecraft:stone,3*minecraft:dirt,minecraft:grass_block;40;village,biome_1,decoration,stronghold,mineshaft,lake,lava_lake,dungeon