While Playing in a flat world i discovered that structures from every biome were appearing in the world (which was a plains flat world) .
the screenshot attached shows an igloo, jungle temple, witch hut, shipwreck, and ruins.
the preset used in the flat world generator is below:
minecraft:bedrock,70*minecraft:stone,5*minecraft:dirt,minecraft:grass_block;minecraft:plains;village,biome_1,mineshaft,stronghold,decoration,lake,lava_lake,dungeon
Thank you for your report!
However, this issue is a Duplicate of MC-180603.
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