Calendar App - Sending out emails for attendees not working for shared calendars

Only the owner of a calendar can send out emails to attendees.

It's stated in the Documentation here:

https://docs.nextcloud.com/server/latest/user_manual/en/groupware/calendar.html#invite-attendees-to-an-event

And there are several issues on github:

https://github.com/nextcloud/server/issues/26668

https://github.com/nextcloud/calendar/issues/2145

However, in the UI the Send e-mail is not greyed out for non-owners of the calendar - they use the feature and wonder why the invited persons are not responding and do not show up at meetings.