Sometimes when restarting Monit it resets all services to unmonitored

Hello all!

I'm using Monit 5.25.1 (on OpenSUSE 15.1), and I sometimes encounter
the following strange issue:  either on restarting monit (via
`systemd`) or rebooting the system I sometimes have all the services
(and other monitored items) reset as unmonitored.

As additional details:
* I do not use `start` / `stop` / `unmonitor` as action to any of my
tests  (just `alert`);
* I do explicitly use `mode passive onreboot nostart` on every monitored item;
* the `state` and `id` files do persist on reboots;

I haven't been able to reliably reproduce this, but it does happen
from time-to-time.

Thanks,
Ciprian.