> What makes you say it's "correct" in this case? Are you testing with a
dnsmasq server that doesn't know about DNSSEC? As we have already
discussed, "unsigned records" != "lacks DNSSEC support".

Right, sd-resolved seems to query for the DO flag (= DNSSEC OK) from the
EDNS0 protocol extension and is then falling back to legacy UDP, without
DNSSEC support. – I still need to dig deeper how this detection is
working in detail.

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https://bugs.launchpad.net/bugs/2119652

Title:
  systemd-resolved-dnssec breaks name resolution on lxd domain

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