DNSSEC on RT-AX86U Pro causing some websites not to load properly

[Intrepid]

When using Quad9 DNS on my router, if I turn ON DNSSEC support on my ASUS RT-AX86U Pro router business.comcast.com will not load properly. When I turn DNSSEC Off the problem is resolved. I'm working with Quad9 technical support currently. Has anyone else heard of DNSSEC on Asus Routers causing issues like this? Thanks!

[Intrepid]

Quad9 replied:

"DNSSEC should not be enabled on a DNS forwarder or DNS client using a recursive service like Quad9 which already performs DNSSEC validation

https://docs.quad9.net/Quad9_For_Organizations/DNS_Forwarder_Best_Practices/#disable-dnssec-validati...

Although we don't have a Setup Guide for ASUS routers with DNS over TLS support, all of our other open-source router guides on https://docs.quad9.net explicitly state that DNSSEC should be disabled at the forwarder level.

I'm guessing some other FQDN used for loading resources on that page is failing to resolve properly when DNSSEC enabled on the router."

I think ASUS router firmware should be changed to disable the use of DNSSEC  with Quad9.