If you have armor OR elytra equiped with any enchantment, the enchantment glint will not show in your inventory preview, or in third person mode. This could be a problem when getting confused in tight situations if your armor is enchanted or not, and can be annoying in most cases.
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This was reported a few times already. I don't know to mark it as duplicate otherwise I'd do it.
Check F3 debug screen to confrim those screenshots were taken one after another, with the only thing changed is the inventory GUI