> Yes, DNSSEC is configured.

HOW do you have DNSSEC configured.  Not a yes/no question.

> Logs say this:

please include more than that; single lines don't help debug.  Attach
the entire syslog if you're unsure how much to paste in.

Also please paste/attach the output of:

$ systemd-resolve --status --no-pager

and

$ journalctl --no-pager -b -u systemd-resolved

I'm specifically looking for lines like this:
"Server returned error NXDOMAIN, mitigating potential DNS violation 
DVE-2018-0001"

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https://bugs.launchpad.net/bugs/1857639

Title:
  DNS server capability detection is broken and has critical
  consequences when DNSSEC is enabled

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