So I had been busy lately but yesterday I was able to play around with my networking again. As I mentioned above the vpn was working perfectly with a fedora-38-xfce template.
When I was playing around with some other networking-qubes the network traffic did not seem to work whenever I started the qube with the network-manager service enabled under the debian-12-xfce template. Switching back to the fedora-38-xfce template the networking was working properly. So I think it might be connected to a bug with the network-manager service. Can anyone verify my observation?
All the qubes I was playig around with had networking enabled!