I do agree that it is correct(TM) behaviour to not ask upstream DNS for
bare ("single label") names. But this is not what this bugreport was
about.

The point is what systemd-resolved does in such a case, where it cannot
consult upstream DNS, and also doesn't find the name in local
/etc/hosts:

It consults the routing table, and, when doing so, it deals wrongly with
link-local inet6 addresses.   That's what this bugreport was about.

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https://bugs.launchpad.net/bugs/1853669

Title:
  systemd resolves own hostname to link local ipv6 address

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