Okay, I used This code to spawn cows outside my base: /setblock ~ ~1 ~ minecraft:mob_spawner 0 replace {EntityId:Cow,SpawnPotentials:[{Type:Cow,Weight:1}]} but when I try it inside this structure... No passive mobs spawn... I changed the biome to and it didn't help at all... I don't understand why I can't do it in this area... I can do it in other areas without problems...
MC-51978
Custom Mob Spawners Do Not Spawn Passive Mobs Underneath Platues (Or whatever there called) (Shown in Screenshot)
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Cows like many other passive mobs require grass to spawn on even when spawning from a mob spawner, this is like skeletons require a light level of 7 or below even when spawning from a mob spawner. So this behaviour is intentional.