The zombie spawners don't seem to spawn baby zombies or zombie villagers anymore. I've seen baby zombie and zombie villagers spawn naturally while exploring a cave but not in my spawner anymore (3hrs test run and usually I hear baby zombies burning to death in my baby zombie trap, so far didn't see any)
Comments 3
/setblock ~ ~ ~ minecraft:mob_spawner 0 replace {SpawnData:{id:Zombie,IsBaby:1,IsVillager:1,PersistanceRequired:1},SpawnPotentials:[{Weight:1,Entity:{id:Zombie,IsBaby:1,IsVillager:1,PersistanceRequired:1}}]}
That should spawn baby zombie villager that are special.
This report is false. I just went into a world in 49b, found a natural zombie spawner, and waited for a bit, and it did eventually spawn both a baby zombie and a zombie villager (though it took a while).