I am working on a minecraft 1.8 server and am trying to make a mob spawner that spawns items. This example:How can I make a spawner that summons Items? works on new versions of minecraft but not on 1.8. It seems that any mob spawners placed down by command blocks don't work. The following command:
/setblock ~ ~1 ~ mob_spawner 0 replace {SpawnData:{id:zombie},Delay:299}
Creates an empty mob spawner that does not spawn anything. I am using minecraft forge with worldedit but no other mods. How can I fix this?