Ethernet Connection not available

  1. Ethernet onboard card (I think this is a ‘Dragon RTL8125’): Worked for you until you disabled the inbuilt bluetooth and connected the USB BT dongle.
    Bluetooth connection failing
Realtek RTL8125 2.5GbE vendor: ASRock driver: r8169 v: kernel
pcie: gen: 2 speed: 5 GT/s lanes: 1 port: e000 bus ID: 0e:00.0
chip ID: 10ec:8125 class ID: 0200
  1. This is a WLAN-BT combination module, BT didn’t work for you. Does WiFi work?
MEDIATEK MT7922 802.11ax PCI Express Wireless Network Adapter

LAN and WLAN are connectet to the same chip on the Mobo (2nd PROM21).

Different kernel and Linux Live ISO has already been suggested by @tbg. If that doesn’t work, install Windows as a test (the ASRock X670E Pro RS is Windows 10/11 certified). This way you can rule out a hardware defect.

EDIT: typo