Comment 4 for bug 1996007

Well, that's interesting, since I'm doing installations nearly on a day-to-day basis - interactive (using subiquity, I think that's what you do, too) and non-interactive (using autoinstall) and didn't ran into this so far - and are also not able to recreate this.

Are you doing the installation in a system that has internet connectivity during install?
In other words, are any potential updates applied during the installation or not?

And which package version of netplan.io is installed?
$ apt-cache policy netplan.io

The interface name tells me that you are using OSA adapters as network devices and I think you are using a common VLAN id 1300 (non of the reserved ones), so in this regard everything seems to be fine.

Is there anything special in your system - is it a DPM or a PR/SM system? Which hw generation is it?
Did you used any special kernel options (like needed for autoinstall basic network config setup)?

Is it possible to share the content of /var/log/syslog, trying to find more hints about what could have happened?
(And is /var/crash still empty in your case/system)?
And is it an LPAR, z/VM or KVM installation?