There is a possibility that the fireworks can no longer be stacked due to the bugfix. To fix this, simply place the old fireworks and dismantle them again.
AFK Check.
In the config you can now set how long the player can be AFK until no more missiles spawn at him.
Code (YAML):
maxAFKTime
: 120
#after X seconds the player is afk (default: 120 Sec = 2 Min