What I expected:
Since the item has the specified minecraft:max_damage component, it would break if the entity it was worn on took damage
What happened:
The item is not damaged when the entity is wounded

Steps to reproduce:

1. Give an item that has no durability by default with the minecraft:max_damage and minecraft:equippable components:

   /give @s minecraft:diamond[minecraft:equippable={slot:feet,damage_on_hurt:1b},minecraft:max_damage=91,minecraft:max_stack_size=1]
   

2. Equip this item
3. Get damaged several times