Fix to prepare_system_state, initial schedule.

        all_jobs.sort(key=lambda j: j['submit_time'])

        self.add_running_jobs_to_queue(all_jobs)

        # Set policy to replay and no backfill to get the original prefilled placement.

        target_policy = self.scheduler.policy

        self.scheduler.policy = PolicyType.REPLAY

        target_bfpolicy = self.scheduler.bfpolicy

        self.scheduler.bfpolicy = None

        # Now process job queue one by one (needed to get the start_time right!)

        for job in self.queue[:]:  # operate over a slice copy to be able to remove jobs from queue if placed.

            self.scheduler.schedule([job], self.running, job.start_time, accounts=self.accounts, sorted=True)

            self.queue.remove(job)

        if replay and len(self.queue) != 0:

            raise ValueError(f"Something went wrong! Not all jobs could be placed!\nPotential confligt in queue:\n{self.queue}")

        # Restore the target policy and backfill for the remainder of the simulation.

        self.scheduler.policy = target_policy

        self.scheduler.bfpolicy = target_bfpolicy

    def run_simulation(self, jobs, timestep_start, timestep_end, autoshutdown=False):

        """Generator that yields after each simulation tick."""