Event disappears from iOS calendar when moving between calendars

[shepda]

Steps to reproduce

1. Create a second calendar in Nextcloud calendar
2. In Nextcloud calendar create an event in the first calendar
3. In iOS Calendar edit the event and move the event to the second calendar.

Expected behavior

The event is displayed correctly in the iOS calendar in the second calendar

Actual behaviour

The user can see the event changed to the second calendar in iOS calendar briefly then it disappears, even after refreshing the calendars.

Calendar app version

4.3.3

CalDAV-clients used

iOS calendar

Browser

Firefox 112

Client operating system

Arch Linux

Server operating system

Fedora

Web server

Apache

Database engine version

MariaDB

PHP engine version

PHP 8.1

Nextcloud version

26.0.0

Updated from an older installed version or fresh install

Updated from an older version

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

In case it helps:

1. After moving the event in iOS calendar to the second calendar the event is displayed correctly in the Nextcloud calendar in the second calendar and the Nextcloud Activity logs shows that the event has been moved from the first to the second calendar

2. The event still doesn't display in the iOS calendar if the event is subsequently updated in the Nextcloud calendar

[eweinhold]

These Events are also not visible on MacOS Calendar, although they are listed in anNextcloud Website ICS export - they are not shown on iOS or MacOS System Calendars :(

NC 26.0.0
Calendar Version OLDER then 4.3.3 -> updated to 4.3.3 did not solve the problem

Current iOS 16.4.1
MacOS 13.3.1

[ChristophWurst]

check the Nextcloud Calendar trash bin (bottom left). Are the events there?

[shepda]

After the event disappears from the iOS calendar it is displayed in the Nextcloud calendar correctly (in the updated calendar) and it's not in the Nextcloud calendar trash bin.

[ChristophWurst]

Dup of #4735