Calendar app shows all events of all calendars in each calendar

Nextcloud version (eg, 29.0.5): 29.0.6
Apache or nginx version (eg, Apache 2.4.25): Apache HTTPD 2.4.x
PHP version (eg, 8.3): 8.1

The issue you are facing:
Probably since the last update to nectcloud 29.0.6 or the last update to calendar app 4.7.16 we face a strange effect in the calender view in Nextcloud.
We have several calendars. These calendars are shared with several members. Whenever one calendar is activated it now shows all events of all calendars in the coloration of the activated calendar.
If there are multiple calendars activated then all events of all calendars are shown multiple times in the according coloration of the calendars.

Is this the first time you’ve seen this error? (Y/N): Y

Any hints to trace the error are very welcome.
Best regards

Maybe this test result helps:
If we create a new event, the new event will not only be saved in the chosen calendar, but in all calendars which are shared with the user who is creating the event.
This should not happen.
Anybody knows how to stop this?

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