Elytra Wings Dissapear when Being Renamed

When i Was trying to rename my Elytra Wings in Creative, They dissapeared when i picked them up from the 3rd slot of the anvil when i was done

To reproduce bug:
1.Get a Pair off Elytra wings
2.Get a Anvil
3.Rename the Elytra to anything you want
4.Pick up the Elytra from the 3rd slot

Thats how the bug works