Comment 2 for bug 1646385

I can't really say how to build up a reproducible situation, but this doesn't need a particularly large environment to have this. But if you just start up an environment in 1.25.6 or so and shut down a unit from outside juju, usually this happens (particularly if a hook failed earlier).

Yeah, usually if you keep retrying eventually it works. But we didn't know this until we got really desperate.