How to correctly set IPv6 Custom DNS Servers

Installing and Using OpenWrt Network and Wireless Configuration
1

Currently, I was going to wan6 > edit > advanced settings > use custom DNS servers.

But I was having a lot of unresolved DNS issues caused by IPv6 (after I disabled IPv6 in lan, all internet issues went away).

Now I see that in the lan interface, there's an option for "Announced IPv6 DNS server". This was left empty, because I assumed that if the device announced itself as the DNS server, then it would use the custom DNS servers in wan6. Is this the case? Or do I have to disable "Local IPv6 DNS server"? Or instead, enter the same custom DNS servers in wan6 in "Announced IPv6 DNS servers?

Edit: My IPv6 only exists in LAN, and it's delegated from wan6 since I have a /64 IPv6-PD.

Edit 2: I just noticed that I had a wrong IPv6 address in the wan6 custom DNS server list. I fixed this, enabled ipv6 again, and things seem to be running smoothly so far... maybe my issue was a wrong ipv6 address (although I had 4 other correct ones higher on the list). But my question still stands, just in case I do have to modify the lan's dns settings.

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No don't change "advertised DNS server" when using internal DNS.. The default configuration will have clients using the router's link-local as the DNS server. The dnsmasq process listens on that IP and will cache and forward requests to external servers which are configured in a network section (wan6) or obtained from the ISP via RA or DHCPv6.

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