This bug has been along time ago. When a snowball hits an armor, the durability decreased even if a snowball is weak and no damage. Also with blaze fireballs, we all know netherite armor dknt decrease durability from any lava or fire objects but blaze fireballs are the only fire objects that can damage netherite durability, bc the fireball is fire and the blaze fireball SHOULDN'T damage the netherite armor's durability.