Calendar will not be rendered with PHP 8.x

[bbs-tghs]

Hi all.
I am trying to use DokuWiki (Version 2022-07-31a Igor) with PHP 8.3.
Try to embed a simple calendar with {{davcal>}}
The Link Settings/Sync appears and seems to work, but the calendar itself is not rendered.
Changing the PHP version back to 7.3 fixes this problem and everything is working fine.

Does anyone have an idea how to fix this problem?

Thanks in advance

[Klap-in]

Can you check your error logs for related messages please and share them here?

[BodoBiker]

My log has following message

PHP is version 8.1.26

Regards,
Bodo Biker