This is a complicated bug.
The fire resist potion still allows player to take fire damage from blazes.
If player takes enough damage from blaze's fireball that the armor breaks, it won't break. Instead it will error out This error will cause the game to crash every time you use 'E' Inventory. Opening a chest does not cause the game to crash. If player dies and drops the error-ed armor, game will crash if armor is picked up. Armor will disappear at that point.
Linked issues
Comments 4
yeah the bug was pretty crippling. I had to use a zombie to help me fix the problem. By that point I was 100% certain it was something with my armor. One thing I didn't include: I was wearing enchanted armor at the time. Which could also be linked to another bug related to enchanted armor.
Thank you for your report!
However, this issue has been closed as Cannot Reproduce.
We were unable to reproduce the problem you are describing in the latest version.
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Thank you for your excellent report!
Sounds like the root cause of REALMS-269.