I had mobs spawning all over my mushroom island and I discovered that the biome will change on the Y level. Sometimes ground level is mushroom shore, but the block above it is ocean. I've seen mobs spawning on these blocks, even if the ground is mushroom biome.
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That bug was for the nether, 3D biomes is not supposed to affect the overworld.
MC-209700 was closed as a duplicate though.
It shouldn't have been closed as duplicate, since 3D biomes is for the nether only.
MC-209558 then
Dupe of MC-173878--