When ever you trade with Piglins and get the soul speed enchanted book you can't put it on anything. If you try to rename it, it shows as it has no enchantments.
Photos of it in attachments.
MC-174723
Dropped Soul Speed books from Piglins can't be enchanted/put on any boots
Resolved
Duplicate
1
This is because these enchanted books have the Enchantments NBT tag, not the StoredEnchantments one. This also explains why the name of the book is blue and not yellow.