getent does not resolve host in .local while avahi does

[MagnusPI]

To reproduce:
1)Set up a shared printer.
2) On a computer in the same local network the printer is seen by cups as a dnssd printer.
3) After setting up the printer as a dnssd printer cups cannot print since it cannot locate the printer.

avahi -a -r and avahi-resolve-host-name are able to resolve the host with the printer.
getent cannot resolve it and cups fails.

As suggested in
https://ask.fedoraproject.org/t/avahi-isnt-being-used-to-resolve-local-domain-names/4911/8
the issue is related to mdns4_minimal in /etc/nsswitch.conf and the absence of /etc/mdns.allow

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: libc-bin 2.31-0ubuntu9.2
ProcVersionSignature: Ubuntu 5.11.0-36.40~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-36-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Sep 26 13:32:43 2021
InstallationDate: Installed on 2020-10-06 (354 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: glibc
UpgradeStatus: No upgrade log present (probably fresh install)