I was setting up NextDNS on my Deco router, which required me to enter the NextDNS IP address manually. When I set the DNS address to auto, both the primary and secondary addresses were passed down to the client from the ISP via DHCP without any problems. However, when I configured the DNS address manually, the primary DNS address that I had specified was assigned, but the router IP address was assigned as the secondary DNS address instead. I don't have parental controls enabled.

I found a workaround by specifying the DNS IP in the DHCP server configuration, but I'd still want to see this issue resolved. Thank you.