Comment 4 for bug 2055333

That's an interesting find, about it working in Mantic. It needs more investigation.

Previous behavior was a bug that was inconsistent with the NetworkManager backend and the documentation, that's why it got fixed in the LTS, after plenty of testing: https://discourse.ubuntu.com/t/netplan-0-106-call-for-testing/33932

Upstream changelogs can be found here: https://github.com/canonical/netplan/releases
Ubuntu changelogs: https://launchpad.net/ubuntu/+source/netplan.io/+changelog

Tags (packaging repository): https://git.launchpad.net/~ubuntu-core-dev/netplan/+git/ubuntu/refs/