Akonadi-upgrade to postgres 17 fails

[Axel Braun]

Good morning,
I wanted to upgrade akonadi to pg 17, following https://userbase.kde.org/Akonadi/Postgres_update

The first steps worked fine, the upgrade check fails:

axel at southpole:~> /usr/lib/postgresql17/bin/pg_upgrade -b /usr/lib/postgresql16/bin -B /usr/lib/postgresql17/bin -d $HOME/.local/share/akonadi/db_data_old -D $HOME/.local/share/akonadi/db_data --check
Führe Konsistenzprüfungen durch
-------------------------------
Checking cluster versions                                     ok

der alte Cluster verwendet keine Datenprüfsummen, aber der neue verwendet sie
Fehlgeschlagen, Programm wird beendet


Translation: The old cluster does not use checksums, the new one does.

How can I work around this?

Thanks
Axel