[MC-90064] /replaceitem not working with Elytra

Steps to reproduce:
1. Type in the following command:
/replaceitem entity @p slot.armor.chest minecraft:elytra
2. There is no step 2

Environment

Windows 10 Pro (64 Bit)
Java 8 (64 Bit)

CPU: Intel(R) Core(TM) i7-4500U CPU @ 1.80GHz
RAM: 8 GB DDR3 RAM

Confirmed bug present.
Voted for the issue as I'm a command block geek 😛

Hope this gets fixed for the next snapshot, I need this asap 😃

Duplicate of MC-89926.