I've tried to directly add dual-stack dhcp-host record
dhcp-host=00:90:XX:XX:XX:24,set:00:90:XX:XX:XX:24,test,192.168.111.20,[2001:470:xxxx:xxxx:xxxx:xxxx:xxxx:1454]
but it doesn't work for IPv6. Dnsmasq resolves IPv4 correctly, but IPv6 always gets forwarded to public DNS Server, and returns...