Upgrade to 24.1 breaks internal communication

[Gamienator]

Hey everyone,

sadly I'm not able to upgrade my OPNSense from 23.7.12 to 24.1.

As soon as I updated none of the internal Network interfaces is reachable. My OPNsense is inside a Proxmox VM, I update from WebUI and after the Reboot I get a WAN IP address via PPPoE and is pingable. But none of my internal devices is reachable, every ping is lost. Which also means I'm not able to connect to the WebUI

Did anybody had this issue as well? And if so, does anybody got an idea what I could do besides from reinstall everything?