For Core119, I'm currently using a patch to /etc/init.d/unbound:
https://gitlab.com/snippets/1706804
because my (only available) ISP mangles port 53 traffic, effectively disabling DNS outside of my private firewall.
I wonder if configuring unbound so that forward requests use DNSSEC over HTTPS or TLS would be a better (and more secure) solution? Also see:
https://forum.ipfire.org/viewtopic.php?f=27&t=20575#p115342
https://forum.ipfire.org/viewtopic.php?f=50&t=20574
Comments and test configurations are welcome!
Paul