Comment 9 for bug 1942289

Juju is designed to keep a unit the leader during the dying phase and will only revoke leadership once the unit transitions to dead, just prior to removal and after all hooks have been run.

The unit, if leader prior to removal, retains leadership so that it may do "leader" type things during the relation departed/broken hooks.

I'll mark as Invalid for juju since the leadership behaviour is by design.