Can anybody see OPPO A54's requests in the log? My children's OPPO A54 requests are not in the log, and I can not block any website. The phone using NextDNS, no VPN app installed. I think maybe a default configuration in ColorOS of OPPO phone.
Some cellphone manufacturer automatically configures a secondary DNS resolver (a default public resolver) if you only use ONE DNS RESOLVER. As the result, the DNS request is not neccessarily going through NextDNS.