Local DNS not resolving

[Bucking_Horn]

@route-dist

IPv6 is disabled on my router. So pihole does not have an IPv6 address. But I probably enabled IPv6 during the pihole configuration process:

That's fine.

I was considering IPv6 as a possible source for your local on-device DNS server at 127.0.0.53 on some of your clients bypassing Pi-hole via IPv6.
I guess since IPv6 is disabled in your router (i.e. no public IPv6 prefix for your network), you should be safe, unless your router would offer its own link-local IPv6 for DNS.