Changes in the calendar are not adopted

An appointment was sent to me via the mail app in Nextcloud. Using the button, I added this appointment to my personal calendar with the plus sign. Everything worked.

Now the appointment has been changed by the organizer. When I wanted to apply these changes to my personal calendar using the plus sign, the appointment was not updated.

Important:
The appointment was a series of appointments (every week). An appointment was deleted by the organizer of the series.

I attach the Nextcloud log file as an attachment

[/details]

Nextcloud version (20.2.0)
Operating system and version (Debian 10)
Apache or nginx version (2.4.38-3)
PHP version (7.3.31-1)

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The same Issue in Nextcloud Version 22.2.3 and 23.0.0

There seem to be more problems in the calendar. Once a birthday is created via a contact, it can no longer be changed in the contact.

The calendar function in Nextcloud seems to be unusable. Something like that cannot be used in real operation.

Totally unusable.

I’ve come a little further now. The problem is only when I create contacts that are exported from the LDAP with birthday and then imported into Nextcloud as a VCard. Then an error message also appears. As soon as I delete the birthday entry, the vCard is accepted without errors.

It seems that Nextcloud doesn’t really work with LDAP entries.