I attached the output of systemd-resolve --status in both cases. There
is no difference. In both cases it says the DNS server is 192.168.0.2
(our local resolver), although it seems it is using another, external
DNS server after a while.

Indeed the cache seems to be flushed when changing networking (e.g.
turning ethernet off and back on through Gnome). Thus resolving works
correctly for a while after changing networking. But after a few dozen
seconds, it starts failing (ie. returning our public IP, as if it was
using an external DNS server) again.

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https://bugs.launchpad.net/bugs/1716976

Title:
  DNS resolver silently switches to an unknown DNS server

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