*** This bug is a duplicate of bug 1897744 ***
    https://bugs.launchpad.net/bugs/1897744

TL;DR:
one affected by this upgrade triggered behavior change needs to set
  options edns0 trust-ad
in /etc/resolv.conf to fix the issue.

And as usual, once you already know what things are about - then (but only then 
:-/ ) you find the important related issues - reported by Laney \o/
Subscribing him to the bug FYI

Debian bug
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=960023
I'll add a bug link to Debian.
Discussed and declared to be systed issue and asked to file upstream.

Which led to ...

Systemd
https://github.com/systemd/systemd/issues/15767
This is fixed in newer systemd and will set trust-ad
I'll add a systemd task to consider backporting this to Focal

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https://bugs.launchpad.net/bugs/1898590

Title:
  Verify DNS fingerprints not working

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