Hi. Since I can't copy between Firefox (or the other way) and RDT I suppose I could have made an error in doing this "manually," but it appears the result is:
/root/project/dnsmasq/forward.c:1050
/root/project/dnsmasq/dnssec.c:887
/root/project/dnsmasq/dnssec.c:1923
/root/project/dnsmasq/dnssec.c:304
/root/project/signals.c:46
Does the following image answer your question re DNSSEC?
I've not touched the settings of this PiHole for a couple of months. Only within the last few days has the "lost connection to API" issue occurred.