Launching fireworks horizontally crashes game.

I created a variation of a basic TNT cannon where a dispenser launches fireworks into the water stream, thus sending them horizontally. If the flight duration of the rockets are 1, there is no problem. If the duration is 2 or 3, the firework will disappear after a short distance and the game will lag out to the point of crashing. Launching fireworks from the dispenser in a vertical direction also works fine.