Ok mine started to fail again so I did some more digging. This seems to have resolved it for me and I never knew this was the proper way to setup IPV6 DNS on my router. I use FiOS so I have native IPV6 service.I have tried your suggestion of disabling ‘validate unsigned DNSSEC’ but it hasn’t made any difference.
"IMPORTANT: for DNS Privacy to work in IPv6, you must set IPv6 DNS Server in IPv6 page (not equivalent to add IPv6 DoT servers on the WAN -> Internet Connection page) to your router's LAN IPv6 Link-Local Address. You can find your router's LAN IPv6 Link-Local Address in System Log -> IPv6 tab. Link-local address starts with fe80."
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