Termine/Restart works but shows ugly error messages

Current Situation

When executing the terminate/restart function for a JobScheduler instance in the JOC Dashboard an error message is shown.

JOC-400
JobSchedulerBadRequestException: com.sos.scheduler.engine.common.async.CallQueue$ClosedException: CallQueue is closed. 'TimedCall 'com.sos.scheduler.engine.kernel.DirectSchedulerClient$$anonfun$respondWithSnapshotFuture$1 <function0>'' is rejected

The reason for this is that JOC fires some api calls like process_class or members after the terminate/restart.

The JobScheduler then terminates and restarts normally

Desired Behaviour

No error message should be shown when executing the terminate/shutdown command.