pocketmine\scheduler\AsyncTask::isGarbage PHP Method

    public function isGarbage() : bool
    {
        return $this->isGarbage;
    }

 public function submitTask(AsyncTask $task)
 {
     if ($task->isGarbage()) {
         return;
     }
     $this->tasks[$task->getTaskId()] = $task;
     $this->pool->submit($task);
 }