Just wanted to point out the Debian 13 installation fails with lots of errors, most notably related to MySQL errors (missing /etc/my.cnf) and is unable to find the docker executable - might be the problem on my part as I've installed docker from the docker.io repo. Not sure if there is any other approach.
This broken install can be made to work somewhat by forcing opencli update --force, but it's not without issues: 500 errors related to missing user table, version number of OpenPanel is not showing up under dashboard and who knows what other problems might be there. I haven't checked further as I went back to Debian 12.
On Debian 12 it just works, except a little error related to apparmor, which got fixed with simple:
apt install apparmor apparmor-utils -y
In short, for those who are interested in running OpenPanel on Debian, version 12 is the way to go. Support for Debian 13 might be there in the future but it all depends on the developers.