When using a crossbow charged with fireworks in creative (maybe survival, but I didn't find any problem in this gamemode) it sometimes does not play the sound and the particles don't apper. Another problem is when you charge the crossbow in creative with the fireworks in the offhand, open the inventory and remove the fireworks from the offhand and use the crossbow up the fireworks sometimes are delayed a LOT. And sometimes the sound is delayed without even doing that.