Lost schedules after reboot

I recently started to make use of scheduled CDA queries. But I now have the problem that these schedules vanish after rebooting the server.

Is this the normal/intended behavior? What do I have to do in order to keep my schedules?

I am am running a pretty plain vanilla 5.4 CE Server within a Docker Container (Ubuntu 14.04 LTS, Java 7). I sticked with the standard configuration of storing data in the hsqldb. I already checked the logs but was not able to find a hint on what is going wrong. But to be honest, I am not 100% sure about what I should be looking for; my first guess was that something is going wrong with persistency and the quartz component.

Any idea on the cause of this issue, how to fix it, or where to look for the root cause?

Any hint will be very appreciated.

Thanks a lot,
Felix