Comment 9 for bug 1804861

Can you attach the complete netplan config? If this is maas deployed then we'll have a /etc/netplan/50-cloud-init.yaml.

And if you can also please on the node:

1)
mkdir /etc/systemd/system/systemd-networkd.service.d/
echo -e "[Service]\nEnvironment=SYSTEMD_LOG_LEVEL=debug" > /etc/systemd/system/systemd-networkd.service.d/10-debug.conf

2) systemctl daemon-reload

3) reboot

And then after rebooting, collect journalctl -b 0 and /run/systemd/network/*