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.
Thank you for your report!
However, this issue is Invalid.
Please put only one bug report in each ticket. It is very difficult to keep track of bugs when they are not in their own tickets.
However, please review the Bug Tracker Guidelines before creating new reports. Be sure to search for an existing issue as it is likely to have already been reported.
For the snowball, does the armor have the Thorns enchantment? If so, be sure to check if the issue occurs without that enchantment and note that on any new report.
For the Blaze Fireball, that item also does Projectile damage, which is probably what is reducing armor durability.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki