Setting a world to superflat with a biome set to Flower Forest (minecraft:flower_forest) causes no passive mobs to spawn (not including bees from hives)
I tested this both with changing the biome on the Tunnelers' Dream preset and the default preset after I realized something was up.
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this is the preset I first encountered this on:
minecraft:bedrock,230*minecraft:stone,5*minecraft:dirt,minecraft:grass_block;minecraft:flower_forest
all I did was modify the Tunneler's Dream preset's biome.
The world you have there doesn't have any of the world decorations, when I make one with the above preset, I get a proper flat flower_forest biome, just with no animals at all.
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I cannot reproduce this:
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