Birthday calendar doesn't get recreated

[kubuntu-newbie]

Steps to reproduce

Delete birthdays calendar
change generateBirthdayCalendar to yes in Calendar.php
change Administration Settings/Groupware/Automatically generate a birthday calendar to off then on
wait for cron.php to run or run it manually (tried both)

Expected behavior

Birthdays calendar re-created

Actual behaviour

Birthdays calendar is still gone

Calendar app version

4.6.7

CalDAV-clients used

none

Browser

Firefox 123.0.2

Client operating system

No response

Server operating system

TrueNAS Scale 23.10.2

Web server

Nginx

Database engine version

PostgreSQL

PHP engine version

PHP 8.2

Nextcloud version

28.0.4 (Kubernetes version 1.6.59, Train: charts)

Updated from an older installed version or fresh install

Fresh install

List of activated apps

No response

Nextcloud configuration

No response

Web server error log

No response

Log file

No response

Browser log

No response

Additional info

No response