Thanks for the bug report, this is due to how SilkSpawners (ab)uses enchantments. Released SilkSpawners 2.0.2, which prevents breaking blocks while holding a mob spawner, easiest way to fix this. Can be disabled (silk touch block breaking re-enabled) if desired with 'denyBreakHoldingSpawner'. The Silk Touch enchantment is actually how SilkSpawners stores the entity ID for its own purposes.. Creaturebox compatibility was removed in 2.0 (it doesn't use the damage value since its stripped on mob spawner items). EDIT by Moderator: merged posts, please use the edit button instead of double posting.