1905870 - calendar events existing on the nextcloud server not visible in thunderbird (not properly syncronized)

Status: RESOLVED DUPLICATE of bug 1694709

(Calendar :: Provider: CalDAV, defect)

Description

[buuuuuuuugzilla]

Attachment: thunderbird bug.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Steps to reproduce:

Synchronize nextcloud calendar via webDAV in thunderbird on two devices (e.g. main pc and laptop)
Delete or create calendar events of all types (multi-day, whole-day, only part of day) on one instance of thunderbird (e.g. my main computer) while the other instance isn't active.

Actual results:

Upon starting the inactive instance of thunderbird, sometimes newly created calendar events (on the other instance) are not visible. Sometimes deleted calendar events aren't deleted.
This issue still persists, when manually pressing "Synchronize" on the calendars.
However the nextcloud web calendar and the Samsung Calendar App show all calendar events correctly.

Steps taken to rule out anything other than a bug in thunderbird:
Only way to fix this issue is to remove and add the calendar source again.
Updated Thunderbird to latest stable version 115.12.2 (64-bit).
Restarted Thunderbird multiple times.
Manually synced calendar.
Made sure both instances of Thunderbird still can create and delete events, when all devices are active at the same time.

Expected results:

All instances of thunderbird and the nextcloud web calendar should show exactly the same calendar events, when synchronized.

Comment 1

[buuuuuuuugzilla]

This issue happens often enough for me, that I cant trust the thunderbird calendar anymore, and i always have to open the nextcloud web calendar to confirm that i am not missing any events which is quite unforunate, as i'm a big fan of thunderbird and the work that has been done in the last years, especially the redesign!