I'm having the same problem. Even when installing with HTTPS, it doesn't work after the installation. If I remove HTTPS, it works, but the panel takes a long time to open and is all buggy. If you run "ufw status," you'll see that port 443 is not enabled. Even with manual installation, it doesn't work.
I have tested it with Hetzner, LetsCloud, AWS, DigitalOcean using Debian, Ubuntu, and RockyLinux, and I can confirm that there is some issue with the new installation. I have a server installed for 15 days with version 6.8.28, and it worked fine. It seems to be a problem with the installation.