Tools and weapons (items with durability that are not armor) if worn lose durability like normal armor, even while having no effect.

Steps to Reproduce:

1. Get a tool/weapon with durability, and the equippable component:

   /give @p minecraft:wooden_axe[minecraft:equippable={slot:'legs'}]
   

2. In survival, run this command and take damage:

   /damage @p 5 minecraft:mob_attack
   

Expected Behavior:
The tool would have not be damaged.

Observed Behavior:
The tool item loses durability.