Did the reboot, and then found ipv6 broken - I was able to address this using the following approach;

sudo sysctl -w net.ipv6.conf.ens18.disable_ipv6=1
sudo sysctl -w net.ipv6.conf.tailscale0.disable_ipv6=1
sudo systemctl restart box

That said, and after a reboot, I then found the Mailserver service was completely down both internally and externally - a closer examination revealed a mail container corruption overlay filesystem reference, preventing the service from starting - ie, mail configuration directory at /home/yellowtent/platformdata/mail/ was missing, preventing automatic recreation by the box service

Would also add that standard recovery attempts(sudo systemctl restart box), was not successful, in-that the mail container would be automatically recreated

A closer look revealed the configuration was missing;
sudo ls -la /home/yellowtent/platformdata/mail/

no such file or directory

And that a forced rebuild was needed;
sudo rm /home/yellowtent/platformdata/INFRA_VERSION

BTW, this same thing happened in previous months with Cloudron, following an automated update - granted, snapshots can(and should), be made priior-to any type of update/OS or otherwise, though I can't help but feel that issues like this should not occur so frequently, even on a personal use level

• hope this helps someone out there