Bedrocks mob spawning is broken still...

so uhhh bedrocks mob spawning is broken, ya i was playing minecraft bedrock on my PC and i was caving, suddenly i had like, 50 zombies on me and i was on normal mode and i dont know why plus i had no torches so i couldnt pervent that. please fix this mojang ( i dont have a video or anything cause i wasnt expecting it)