Can't "use" off-hand rockets while flying with Elytra with Touch controls.

This is for the new touch controls for Minecraft PE. If you wear an elytra and press the crouch button with fireworks in the off-hand, it will not work. For example, if you put a shield in your off-hand, pressing crouch will use the shield instead of crouching. Yet if you put fireworks in your off-hand while wearing an elytra and press crouch, it will not use the fireworks instead of crouching. When you are holding fireworks in your off-hand, then crouch while wearing an elytra, it should use the fireworks.

 

How to do this:

1. Put on an elytra, put a shield in your off-hand, jump off a cliff and fly around, then press the crouch/down-arrow to use the shield. Notice how you can use the shield.
2. Put on an elytra, put fireworks in your off-hand, jump off a cliff and fly around, then press the crouch/down-arrow to use the fireworks. Notice how the fireworks does not do anything.