I would like to add the ability to silk touch and keep the data of spawners, but nothing I try seems to be working. I instead decided to give the player an empty spawner so they can just use a spawn egg without having free access to a pig spawner in the meantime. I used the following command/nbt data:
/give @p spawner{BlockEntityTag:{SpawnData:{id:""},SpawnPotentials:[{id:""}]}}
This spawner works fine if placed in creative. It is empty and does not spawn mobs.
The EXACT same spawner ignores nbt data and defaults to a pig spawner if placed in survival.
Thank you for your report!
We're tracking this issue in MC-105216, so this ticket is being resolved and linked as a duplicate.
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