Comment 13 for bug 2020849

I would certainly try to upgrade from 2.9.42 to 2.9.49. Some of the relation issues that you are seeing are likely fixed in 2.9.45: https://bugs.launchpad.net/juju/+bug/2011277
or
https://bugs.launchpad.net/bugs/2022855

You can see the high level of fixes here:
https://juju.is/docs/juju/roadmap#juju-juju-29-45

That doesn't directly impact `juju status` reporting whether or not the agent is 'lost', but it potentially addresses other issues that you're seeing.