nextcloud / nextcloud/calendar

Deleted calender events in Thunderbird/Macbook appearing again from nextcloud calender

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#7,620 8 comments 0 reactions 1 assignee View on GitHub

@SebastianKrupinski is already working on this.

Since Oct 23, 2025.

0. to triage bug
Dominant language
JavaScript
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Description

Steps to reproduce
  1. add nextcloud caldav in thunderbird/macbook calender
  2. get the calender invitiation from some user and save it into your nextcloud calender using Thunderbird
  3. the meeting organizer cancel/delete the meeting and send you the event updates when you click on delete/update, it actually deletes the event in thunderbird/macbook calender but after sometime it appears again, when we checked the event in the nextcloud web calender the event is not there so it's seems like the problem is with nextcloud calender caldav synchronization
Expected behavior

deleted events should not appear again in thunderbird, caldav is not synchronizing properly

Actual behavior

deleted events are not synchronizing with Thunderbird, nextcloud web interface does not have events but nextcloud calender that we added in thunderbird does have event, (no it's not from other/local calender)

Calendar app version

Version 5.5.5, AGPL-licensed

CalDAV-clients used

Thunderbird in Macbook

Browser

No response

Client operating system

No response

Server operating system

No response

Web server

Apache

Database engine version

MariaDB

PHP engine version

PHP 8.1

Nextcloud version

30.0.10

Updated from an older installed version or fresh install

Updated from an older version

List of activated apps
Enabled:
  - activity: 3.0.0
  - admin_audit: 1.20.0
  - app_api: 4.0.6
  - appointments: 2.4.6
  - bookmarks: 15.2.0
  - bruteforcesettings: 3.0.0
  - calendar: 5.5.5
  - circles: 30.0.0
  - cloud_federation_api: 1.13.0
  - comments: 1.20.1
  - contacts: 7.3.2
  - contactsinteraction: 1.11.0
  - dashboard: 7.10.0
  - dav: 1.31.1
  - deck: 1.14.6
  - drawio: 3.0.9
  - external: 5.5.2
  - federatedfilesharing: 1.20.0
  - federation: 1.20.0
  - files: 2.2.0
  - files_antivirus: 5.6.6
  - files_downloadlimit: 3.0.0
  - files_external: 1.22.0
  - files_pdfviewer: 3.0.0
  - files_reminders: 1.3.0
  - files_sharing: 1.22.0
  - files_trashbin: 1.20.1
  - files_versions: 1.23.0
  - firstrunwizard: 3.0.0
  - keeweb: 0.6.21
  - lookup_server_connector: 1.18.0
  - nextcloud_announcements: 2.0.0
  - notifications: 3.0.0
  - oauth2: 1.18.1
  - onlyoffice: 9.10.0
  - password_policy: 2.0.0
  - photos: 3.0.2
  - polls: 8.3.10
  - privacy: 2.0.0
  - provisioning_api: 1.20.0
  - recommendations: 3.0.0
  - related_resources: 1.5.0
  - serverinfo: 2.0.0
  - settings: 1.13.0
  - sharebymail: 1.20.0
  - spreed: 20.1.10
  - support: 2.0.0
  - survey_client: 2.0.0
  - systemtags: 1.20.0
  - text: 4.1.0
  - theming: 2.6.0
  - twofactor_backupcodes: 1.19.0
  - twofactor_totp: 12.0.0-dev
  - updatenotification: 1.20.0
  - user_ldap: 1.21.0
  - user_saml: 7.0.0
  - user_status: 1.10.0
  - viewer: 3.0.0
  - weather_status: 1.10.0
  - webhook_listeners: 1.1.0-dev
  - workflowengine: 2.12.0
Disabled:
  - encryption: 2.18.0
  - files_rightclick: 0.15.1 (installed 1.6.0)
  - files_videoplayer: 1.13.0
  - logreader: 3.0.0 (installed 2.13.0)
  - suspicious_login: 8.0.0
  - twofactor_nextcloud_notification: 4.0.0
Nextcloud configuration

Web server error log

Log file

Browser log

Additional info

No response

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