1. Unequip the Elytra while ascending with firework rocket.
2. Player crashes onto the ground.
3. Players will not take damage.
1. Unequip the Elytra while ascending with firework rocket.
2. Player crashes onto the ground.
3. Players will not take damage.
I can't reproduce this.
A few snapshots ago, we accidentaly had a gamerule activated that disabled all falling damage. If you upgraded from that snapshot you might still have that rule active.
Please try /gamerule fallDamage true and see if the issue persists.