Here is my /var/log/dist-upgrade/main.log. After upgrade from 21.10 to 22.04, gtk-common-themes snap was on latest/stable/ubuntu-19.04 channel.
** Attachment added: "main.log" https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1971987/+attachment/5589325/+files/main.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1971987 Title: On release upgrade, Snaps don't change channel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1971987/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs