Glint on items affects the same item of that item

I’m trying to play around with an enchanting table, and to my surprise; I found a bug that causes the item that is enchanted will affect the same as that item

Here’s an easier example to understand more easily: Enchanted Item A will have a glint that will affects all item that is A (which the glint of A will affect all A’s, and B will affect all B’s)

Steps to reproduce:
Enchanting Table:

1. Grab one of any combat/tool items

2. Duplicate your desired combat/tool item a few or more

3. Enchant one desired combat/tool item

4. Check glint on your enchanted item and your normal item

Anvil:

1. Grab one of the items from your creative inventory

2. Grab any Enchanted book

3. Duplicate your desired item a few or more

4. Enchant one desired item on an anvil

5. Check glint on your enchanted item and your normal item