StringItem is now a generic class for any item that has a separate Block as a placeable form. This includes string as well as all seeds, carrots, potatoes, sweet berries, cocoa beans, nether wart, and redstone dust. Given this, I think the class should be renamed to reflect its new usage.
It's not a placeable item, it's an ItemBlock with a different translation key from the block.
perhaps DistinctBlockItem
How about AliasedBlockItem
?
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How about
AliasedBlockItem
?