Removed Single Occurrence of Reoccurring, Confidential Event Remains on Shared Calendar

[Tally]

Steps to reproduce

1. Create a reoccurring event that only shows as "busy" when shared.
2. Share this calendar.
3. Delete an occurrence of this series.

Expected behavior

The single occurrence is deleted from both the owner calendar and the shared, confidential version of the calendar.

Actual behaviour

Occurrence is deleted from the owner calendar, but it remains on the shared calendar (but is not listed in the owner trash; I assume it's actually being made invisible).

Changing the reoccurring event to show "full" details when shared, caused the deleted event to disappear from the shared calendar as well.

Calendar app version

4.6.6

CalDAV-clients used

DAVx5

Browser

Brave 1.63.174

Client operating system

Windows 11

Server operating system

Raspbian Bookworm

Web server

Apache

Database engine version

PostgreSQL

PHP engine version

PHP 8.1

Nextcloud version

28.0.3

Updated from an older installed version or fresh install

Fresh install

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

No response

[miaulalala]

Reproducible on main.

Not a caching issue.

Backend issue - data is not converted correctly:

Sharer

Sharee

BEGIN:VCALENDAR CALSCALE:GREGORIAN VERSION:2.0 PRODID:-//IDN nextcloud.com//Calendar app 4.7.0-beta.4//EN BEGIN:VEVENT CREATED:20240320T135748Z DTSTAMP:20240320T135827Z LAST-MODIFIED:20240320T135827Z SEQUENCE:3 UID:533f7c47-3f4c-47b9-8b91-c694acf14318 DTSTART;VALUE=DATE:20240321 DTEND;VALUE=DATE:20240322 STATUS:CONFIRMED SUMMARY:Test CLASS:CONFIDENTIAL RRULE:FREQ=DAILY;UNTIL=20240327T230000Z EXDATE;VALUE=DATE:20240322 END:VEVENT END:VCALENDAR

VERSION:2.0 CALSCALE:GREGORIAN PRODID:-//IDN nextcloud.com//Calendar app 4.7.0-beta.4//EN BEGIN:VEVENT CREATED:20240320T135748Z UID:533f7c47-3f4c-47b9-8b91-c694acf14318 DTSTART;VALUE=DATE:20240321 DTEND;VALUE=DATE:20240322 SUMMARY:Busy CLASS:CONFIDENTIAL RRULE:FREQ=DAILY;UNTIL=20240327T230000Z END:VEVENT END:VCALENDAR

[Tally]

I'm still having issues getting congruence between my DAV calendar on my clients and my web calendar in this situation. The most common situation lately is that I can delete a single instance on the CalDAV client (Samsung calendar on Android), which works and is persistent, but the instance remains on the web calendar. Attempting to delete the event on the web calendar is unsuccessful. In fact, at the moment, deleting any single instance of these recurring events on the web calendar is unsuccessful, but it is missing from an exported ICS of the calendar. Considering that my primary use for this calendar is to share my schedule (which is unusual) simultaneously via web or subscription access while being able to modify it from my phone, this is a critical deficiency.

Thanks for the support and your work on Nextcloud generally.

Nextcloud Hub 8 (29.0.7), AIO Dockerized version
Calendar 4.7.16