Elytra Custom Durability

Changing custom durability on Elytra has no effect on how fast the elytra loses durability, decrease speed matches vanilla. Config I'm using is below.

armored_elytra:
  Id: ELYTRA
  Group: Pride Elytra
  CustomDurability:
    Durability: 1500
  Enchantments:
  - protection:4
  Attributes:
    Chest:
      KnockbackResistance: .1 ADD
      Armor: 8
      ArmorToughness: 3
  ItemUpdater:
    Version: 2              
    PreserveStatRatio: true  
  Options:
    PreventAnvil: false
    PreventEnchanting: false
  Display: 'Armored Elytra'
  Recipes:
    SHAPED:
      Type: SHAPED
      Amount: 1
      Ingredients:
      - netherite_chestplate | elytra
      - air | air