Elytra doesn’t render when wearing two capes simultaneously

The elytra doesn’t render when wearing the Minecon 2011, 2012, 2013, 2015, 2016 cape skin from the “MINECON 2016 Skin Pack” and the Ender Dragon cape skin from the “1st Birthday Skin Pack”.
I attached some images of the elytra on and off with these skins.

Steps to reproduce:

1. Download any skin pack from the Marketplace that has skins with capes (examples: MINECON 2016 Skin Pack, 1st Birthday Skin Pack);
2. Equip one of the capes to your character (Founder's Cape, Pancape);
3. Equip a skin that has a cape;
4. Put on an elytra.

Observed Results:
Elytra doesn’t render, like how the elytra didn’t render when wearing the “Pancape” cape.

Expected Results:
The elytra should render with a cape texture on it.