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!A variety of coloured blocks inside invisible sulfur cubes using this datapack
Applying the name tag
!A sulfur cube turning invisible after being named "invisible" with a name tag
Giving a block to a pre-named sulfur cube
!A named sulfur cube turning invisible after a block is fed to it/added
Removing a block from an invisible sulfur cube
!A sulfur cube becoming visible again after its block is removed from it
Note: I made this datapack very quickly so there may be a few bugs I don't know about, I will try to fix any issues as they come.