When you shoot a Firework with a Crossbow, it will keep the texture of the loaded Firework on the Item Bar after shooting it if you don't have more Fireworks in reserve.

To reproduce:

1. Load a Firework on a Crossbow
   1. Drop or Store any Arrows or Fireworks left (if any)
2. Shoot the Firework
3. See how the Crossbow still shows a Firework loaded on the Item Bar

I tested on a Survival Dedicated Server and a Local Creative World.