Less Hostile Mobs in cherry blossom groves

Ok, so I was just chilling in the new amazing peaceful cherry blossom biome when all the sudden I'm fighting Pual the Zombie Villager and Steve the reborn. Why would so many mobs spawn in such a beautifully innocent biome. So what if they had some sort of natural Spawn Proofing, not necessarily like mushroom biomes (because that's all those biomes have going for theme) but a plant that emits low light levels but found all over blossom biomes preventing the spawning of hostile mobs.