Elytra flight enables when ending creative flight

Steps to reproduce bug:

1. In creative mode, equip the elytra.

2. Begin creative flight (double tap space)

3. Stop flying and try to fall to the ground

Expected behaviour: The player stops flying and falls to the ground.

Actual behaviour: The elytra enables and causes the player to glide.

The elytra is supposed to only enable with a third spacebar tap, allowing the player to fall to the ground if they want, or glide with an extra tap if they want that instead. With this bug, the elytra enables after the second tap, preventing the player from falling to the ground.