Comment 2 for bug 1805327

In the case of an action managed upgrade, the action that performs the upgrade reconfigures the source, not the config-changed hook (so that's expected behaviour).

You're correct in that you do need to step through:

   xenial/mitaka -> xenial/newton -> xenial/ocata -> xenial/pike -> xenial/queens

A direct jump from mitaka -> queens won't work.