I was doing a texture pack whith notch's face in a enchanted golden apple and noticed this strange behavior. Since in the latest snapshots mojang is improving the enchant glint I remembered this bug and searched if it was already reported. I think this is a valid bug because it is related to resource pack support.

Steps to reproduce:

1. Install a resourcepack with, as an example, an HD golden apple with a resolution higher than 32px (the higher the resolution, the more the bug will be noticeable).
2. Obtain the item with the HD texture and enchant it (if not already) to see the enchant glint.
3. The enchant glint will look strange.