Armor bug, Can't using armor. (Only for creative in inventory)

Sometimes the armor can't be used, (No shield). It is a bug. Device: OPPO CPH1901, 4gb Ram, 64gb storage.

Step to reproduce:

1. Change armor with a elytra, turtle shell, or more
2. The armor cant be used

Resuit:

The armor cant be used.

Note:

Only affected in creative mode in inventory add item