So this is on Bullseye now, right? WiFi works but the Ethernet adapter is not detected at all. Can you share:
ip l
ip a
ip r
dmesg
Good to have the full kernel log to see whether there was some attempt to load the Ethernet driver, or some failure about it. This is not about the userspace tools btw, but kernel related. Strange only that it works with the very same kernel on a fresh Bullseye image and for most others (only report with broken Ethernet?) with an upgraded image as well.