I have Note 20 Ultra 5G N9860, since beginning I was using DeX with my Nexdock.
After update to Android 13 yesterday, DeX stopped working.
No way to turn it ON. Only simple screen mirroring via 40gbps USB-C cable.
My android version:
Android 13, OneUI 5, N9860ZCU2DUDA TGY/TGY