firebird3.0 server installation with specific passwords fail

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During the Installation og firebird3.0-server on a headless Ubuntu 20.04 server (german locale) a password is queried. If that password contains a space followed by a number, the installation fails with an error code. The part of the password after the space is interpreted as a paramater.

E.g. password is 'test 2021', 2021 is treated as a paramater.

The output is as following:

/var/lib/dpkg/info/firebird3.0-server.postinst: 46: local: 2021: bad variable name
dpkg: Fehler beim Bearbeiten des Paketes firebird3.0-server (--configure):
 »installiertes firebird3.0-server-Skript des Paketes post-installation«-Unterprozess gab den Fehlerwert 2 zurück
Trigger für systemd (245.4-4ubuntu3.4) werden verarbeitet ...
Trigger für man-db (2.9.1-1) werden verarbeitet ...
Trigger für libc-bin (2.31-0ubuntu9.2) werden verarbeitet ...
Fehler traten auf beim Bearbeiten von:
 firebird3.0-server
E: Sub-process /usr/bin/dpkg returned an error code (1)

Ubuntu Release

Description: Ubuntu 20.04.2 LTS
Release: 20.04

Package Version

firebird3.0-server:
  Installiert: 3.0.5.33220.ds4-1build2
  Installationskandidat: 3.0.5.33220.ds4-1build2
  Versionstabelle:
 *** 3.0.5.33220.ds4-1build2 500
        500 http://de.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status

Expected: The usage of passwors with spaces and number should be possible.
What happened: Passwords with spaces and numbers don't work