Pressing space while flying using elytra will cancel the flight and make you fall.

When you press space while flying an elytra, it will cancel your flight and you will stop flying.

What I expected to happen was...
When you press space whilst flying, you should not stop you flying

What actually happened was...
I stopped flying and fell.

Steps to Reproduce:
0. Go into survival mode
1. Start flying
2. Press space
3. You stop flying and fall