The bug
Spawners do not spawn monsters anymore even if the required conditions are met.
How to reproduce
Set the difficulty to something different than "Peaceful" (
/difficulty easy
)Set the time to night
/time set night
Use the following command
/setblock ~ ~ ~ mob_spawner 0 replace {SpawnData:{id:"Zombie"}}
Note: This worked for 1.9-pre1
Linked issues
duplicates 1
Comments 3
I can replicate this - rolled a backup of my singleplayer world back to pre 1 and zombies started spawning immediately.
Most likely related to MC-97491