When I try to sell Enchanted Books, the Books dont actually have the enchantment. Even after I bought them. I also tried using them in an anvil but that didnt work out either. When Ive bought the sword or the axe Im ablte to see the enchantment. Im on 1.15.2 Spigot.
Enchanted:
'0':
type: SHOP
id: ENCHANTED_BOOK
buy-price: 6000.0
enchantments: EFFICIENCY:1
'1':
type: SHOP
id: DIAMOND_SWORD
buy-price: 100
shop-lore:
- '&aThis is the sword of unbreakingness'
shop-name: '&bSword of the &0Unbreaking'
enchantments: DURABILITY:1
buy-lore:
- '&aPurchased by {PLAYER_NAME} for {BUY_PRICE}'
'2':
type: SHOP
id: STICK
buy-price: 6000.0
enchantments: EFFICIENCY:1

For further bug tracing, I have tried this in 1.15.2,1.14.4 and 1.14

I have tried, adding the book with the guishop edit command and I have also tried adding it in the config, neither did anything but give a book that has an enchanting glow but nothing more.

Can reproduce with 1.15.2

I think the issue is that Bukkit differs between Entchantments and StoredEntchantments.

For the books there should be a stored-entchantments option for the shops.yml, I think.

This will be implemented for 8.2