Comment 3 for bug 1950039

Fyi, the current configuration is the same as firewalld upstream and what is in Debian. Moreover it is following systemd documentation for firewall software so I wonder if the change simply uncovered a latent bug....

Fyi, I won't be able to look at this for a while so if you need to back it out, please do an ubuntu1 upload (though it would be great if someone more familiar with systemd-networkd thought through my latent bug comment).