The enchantment ID in the NBT data of a book, which is supposed to be synthesized into an enchanted book by charging it in the Tesla Coil, is incorrectly written as "efficiency" without the "minecraft:" prefix. Moreover, the enchantments' NBT tag should be "StoredEnchantments" instead of "Enchantments". This issue results in the book being incorrectly recognized as an already enchanted book rather than an enchantment book.
The enchantment ID in the NBT data of a book, which is supposed to be synthesized into an enchanted book by charging it in the Tesla Coil, is incorrectly written as "efficiency" without the "minecraft:" prefix. Moreover, the enchantments' NBT tag should be "StoredEnchantments" instead of "Enchantments". This issue results in the book being incorrectly recognized as an already enchanted book rather than an enchantment book.