Enchanted books lose enchantments when upgrading from 1.12.2 to 1.13-pre3

Enchanted books lose enchantments on upgrading from 1.12.2 to 1.13-pre3.

To reproduce: -

• create a world in 1.12.2

• put an enchanted book in a chest (single or double)
  

  [media][media]

• open world in 1.13-pre3

• look at enchanted book
  

  [media][media]

The books seem to have NBT data but don't display any enchants and don't work in an anvil: -