After enchanting an enchanted book using the enchanting table, some enchantments will be ghost enchantments without a category.
These can be grindstoned, or will be removed when merging enchantments.
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An enchantment rework that categorises enchantments to be mutually exclusive. vulpixel.org
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Enchanting Table Enchanted Book Ghost Enchantments #1
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This bug seems to only affect Enchanted Books from what I've tested.