The Bug:
Player/Mob heads heads don't display enchantment glints like other items, such as armor and swords.
How to Reproduce:
/give @s minecraft:player_head{Enchantments:[{}]}
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Hi there!
I can confirm (no resource packs, 20w28a vanilla snapshot).

My bad, MC-69683.

This bug was marked duplicate incorrectly. The other bug speaks only of block entities.
Mob heads are block entities/blocks with entity rendering. The item models specifically use parent buildin/entity.
Does this happen without a resource pack enabled? Please also provide a screenshot of this occurring with your F3 debug screen enabled.