2000216 - Deleting occurrence of a recurring event on a remote calendar is not taken into account locally

Status: UNCONFIRMED

(Calendar :: Provider: CalDAV, defect)

Description

[Mathieu Clabaut]

Steps to reproduce:

1. add nextcloud caldav in thunderbird
2. get the calendar invitiation for a recurring event from some user and save it into your nextcloud calendar using Thunderbird
3. the meeting organizer cancel one occurrence of the meeting and send you the event updates. When you click on delete, it actually deletes the event in thunderbird but after sometime, it appears again, when we checked the event in the nextcloud web calender the event is not there.

Actual results:

After sometime, the deleted occurrence appears again,

Expected results:

The deleted occurrence should not appears again.

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There is a related issue raised in nextcloud : https://github.com/nextcloud/calendar/issues/7620
The comment seems to imply that TB not handling EXDATE according to the RFC.

Comment 1

[Vlad Lucaci, Thunderbird QA (:vlucaci)]

Hello,

I tried to reproduce this issue using 147.0a1(20251117100308) with Windows 11, macOS 15 and Ubuntu 25 and could not reproduce.

Are you still able to reproduce this issue with the same repro steps? Are you receiving any error in the Error console(CTRL+Shift+J) when this issue occurs?

Comment 2

[Mathieu Clabaut]

Sorry, I didn't have time to setup a reproducer. I'll try again next week.

Comment 3

[Wayne Mery (:wsmwk)]

(In reply to Mathieu Clabaut from comment #2)

Sorry, I didn't have time to setup a reproducer. I'll try again next week.

any luck?