The enchantment glint is lost when enchanted items are dropped. It occurs when the player drops it, it was in a chest that was broken and when removed from item frames. It occurs with every tier of tools and weapons and also occurs on bows, enchantment books, elytras and fishing rods
You can duplicate this bug by simply enchanting an item and then dropping it.
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-186108.
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