M1 MBP here. This seems widespread on the macOS 15-XCode 16 P RCs. I have filed a feedback, as have others.

On a Monterey 12.4 host (Intel), I just updated a VMWare Fusion guest to Ventura. The VM had been running the latest 12.5 beta. Just like that, no more network. On the Network panel in the Ventura's new System Settings, ethernet shows as disconnected.