[Bug 1925761] [NEW] libnns-mymachines update breaks local mdns discovery

[Givrix]

Public bug reported:

After the last systemd update 245.4-ubuntu3.6 on 20.04 focal, I discovered I couldn't use .local network names anymore. All returning Name or service unknown.
Nothing explicitly showing a problem in avahi-deamon systemd logs, no firewall activated, and no changes done to /etc/nsswitch.conf.

After noticing those packages just had been updated, I downgraded systemd to 245.4-ubuntu3 through aptitude and it works again.
So I'm pretty sure something's wrong with last package from focal-updates of libnss-mymachines.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1925761

Title:
  libnns-mymachines update breaks local mdns discovery

Status in systemd package in Ubuntu:
  New

Bug description:
  After the last systemd update 245.4-ubuntu3.6 on 20.04 focal, I discovered I couldn't use .local network names anymore. All returning Name or service unknown.
  Nothing explicitly showing a problem in avahi-deamon systemd logs, no firewall activated, and no changes done to /etc/nsswitch.conf.

  After noticing those packages just had been updated, I downgraded systemd to 245.4-ubuntu3 through aptitude and it works again.
  So I'm pretty sure something's wrong with last package from focal-updates of libnss-mymachines.

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