Netherite Armor Will stop registering the DMG resistance it provides

The bug is fairly lethal in terms of death which could be bad for hardcore players. I will provide as much as I can. 

Bug:

*Full netherite armor (enchanted)

• • • Helmet has Respiration 3, Mending, Unbreaking 3, Aqua Affinity, and Protection 4

*Chestplate has Protection 4, Unbreaking 3, Mending

*Leggins have Blast Protection 4, Unbreaking 3, Mending

*Boots have Protection 4, Unbreaking 3, Mending, Depth Strider 3, Soul Speed 3, Feather Falling 4

All Armor above was upgraded to netherite in the Smithing table. Was not enchanted as Netherite.

Amount of time since slept has been about 7 days.

Specifically with the Phantom mob

After allotted amount of time full dmg was taken from the Phantom mob (1 1/2 hearts after relogging and 2 1/2 hearts before)

Unknown if this bug persists with other mobs.

One datapack running for Shulker shell drops, Should not affect the phantom.

World was transferred over to 1.16.1 was started in 1.16 candidate release 1