Comment 11 for bug 1875496

tl;dr This is a layer basic bug not an OpenStack charms bug

Per fnordahl's hint I built a new version of designate (with the charms.openstack changes) with layer-basic one commit before https://github.com/juju-solutions/layer-basic/commit/597bed6d22b93ed0754f3f02b632ebbcf8206596 and it upgrades without error.

That seems like pretty definitive proof this is a layer-basic bug.

For future tests:
From cs:designate-38 to cs:designate-41 shows the failure.

cs:~thedac/designate-0 has layer-basic @ commit 0c8d7e28aeb87394dca57e76593ffcb7cc936cfa and everything else up to date.

From cs:designate-38 to cs:~thedac/designate-0 successfully upgrades.