Armor Durabilities never decrease when you're killed within one hit.

Note: This is not a dupe of MCPE-173850. 

Steps to Reproduce:

Open a world and ask one of your friends to join in. After you put on a leather suit, ask them to grab a Sharpness V Netherite Sword.(That will be able to kill you instantly with Critical Attack.) Then ask them to kill you.

Observed Result:

You're killed instantly, and the armor didn't decrease any durability.

Expected Result:

You're killed and the armor durability should decrease.