In minecraft pre-release for 1.13, zombies wearing leather helmet loose their headwear after a while. This allows them to burn in daylight, thus posing an obstacle for map-makers.
The zombie on which I first observed the bug was spawned using /summon (with custom nbt).
I have also attached its nbt below along with my computer specs.
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Pretty sure that zombie's armor doesn't take damage under sunlight. Also they weren't subjected to any external damage. (The zombies also had the invunerable tag)
Just taking a wild guess here... durability of the helmet running out?