Thorns reduces armor durability even if the attacker is immune to it

Thorns reduces armor durability even if the attacker is immune to it.

To reproduce

1. /summon minecraft:mannequin ~ ~ ~ {equipment:{head:{id:leather_helmet,components:{enchantments:{thorns:3}}}}}

2. While remaining in creative mode, punch the mannequin several times

3. /data get entity @n[type=mannequin] equipment.head.components
   ❌ The mannequin’s helmet has taken damage

Expected result

Its helmet should not have taken damage since you were immune to Thorns due to being in creative mode. (Per MC-27061, this durability reduction would be intended if you were in survival mode.)