Found a bug for XT8_V2 (ZenWiFi AX, Firmware Version: 3.0.0.4.388_24814)
When in administration settings in the basic config Network Monitoring DNS to my own DNS-Server (myown-server.duckdns.org) I can see in my Pi-hole log (as the authoritative DNS) that the Mesh-Master is indeed using this DNS Server to check internet c...