[Bug]: Calendar reminders are auto-dismissed

[Fjodor42]

Steps to reproduce

1. Create calendar event
2. Set reminders for said event

Expected behavior

1. Create calendar event
2. Set reminders for said event
3. Fail to do whatever the event was about
4. Correctly abstain from dismissing reminder
5. Be mindful of need to do whatever the event was about, as a consequence of the reminders not having been dismissed
6. Do whatever the event was about at such a time as possible within one's space of possibility
7. Correctly dismiss reminder
8. ?
9. Profit

Actual behavior

1. Create calendar event
2. Set reminders for said event
3. Fail to do whatever the event was about
4. Correctly abstain from dismissing reminder
5. Have reminder auto-dismissed by ways of this bug at EoD
6. Fail to actually do whatever the event was about at a later time, as event was auto-dismissed

Calendar app version

6.2.1, but present since December 2025

CalDAV-clients used

Thunderbird, DAVx5, NextCloud Desktop Client

Browser

Firefox

Client operating system

Ubuntu Linux 25.10

Server operating system

Ubuntu Linux 24.04 LTS

Web server

Apache

Database engine version

PostgreSQL

PHP engine version

PHP 8.3

Nextcloud version

32.0.6, but present since December 2025

Updated from an older installed version or fresh install

Updated from an older version

List of activated apps

Enabled:
  - activity: 5.0.0
  - admin_audit: 1.22.0
  - app_api: 32.0.0
  - bruteforcesettings: 5.0.0
  - calendar: 6.2.1
  - circles: 32.0.0
  - cloud_federation_api: 1.16.0
  - comments: 1.22.0
  - contacts: 8.3.4
  - contactsinteraction: 1.13.1
  - dashboard: 7.12.0
  - dav: 1.34.2
  - deck: 1.16.3
  - federatedfilesharing: 1.22.0
  - federation: 1.22.0
  - files: 2.4.0
  - files_downloadlimit: 5.0.0-dev.0
  - files_external: 1.24.1
  - files_pdfviewer: 5.0.0
  - files_reminders: 1.5.0
  - files_sharing: 1.24.1
  - files_trashbin: 1.22.0
  - files_versions: 1.25.0
  - firstrunwizard: 5.0.0
  - logreader: 5.0.0
  - lookup_server_connector: 1.20.0
  - nextcloud_announcements: 4.0.0
  - notifications: 5.0.0
  - notify_push: 1.3.0
  - oauth2: 1.20.0
  - password_policy: 4.0.0
  - photos: 5.0.0
  - privacy: 4.0.0
  - profile: 1.1.0
  - provisioning_api: 1.22.0
  - recommendations: 5.0.0
  - related_resources: 3.0.0
  - serverinfo: 4.0.0
  - settings: 1.15.1
  - sharebymail: 1.22.0
  - socialsharing_bluesky: 4.0.1
  - socialsharing_facebook: 4.0.1
  - socialsharing_twitter: 4.0.1
  - spreed: 22.0.9
  - support: 4.0.0
  - survey_client: 4.0.0
  - systemtags: 1.22.0
  - text: 6.0.1
  - theming: 2.7.0
  - twofactor_backupcodes: 1.21.0
  - updatenotification: 1.22.0
  - user_status: 1.12.0
  - viewer: 5.0.0
  - weather_status: 1.12.0
  - webhook_listeners: 1.3.0
  - workflowengine: 2.14.0
Disabled:
  - encryption: 2.20.0 (installed 2.10.0)
  - suspicious_login: 10.0.0 (installed 4.2.1)
  - twofactor_nextcloud_notification: 6.0.0
  - twofactor_totp: 14.0.0
  - user_ldap: 1.23.0

Nextcloud configuration

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "hashingCost": 10,
        "trusted_domains": [
            "nephele.molgaard.org"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "overwrite.cli.url": "https:\/\/nephele.molgaard.org",
        "version": "32.0.6.1",
        "dbtype": "pgsql",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "logtimezone": "UTC",
        "installed": true,
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "filelocking.enabled": true,
        "filelocking.ttl": 3600,
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.local": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0,
            "timeout": 0
        },
        "maintenance": false,
        "loglevel": 2,
        "logfile": "\/var\/log\/nextcloud\/nextcloud.log",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "25",
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "overwritehost": "nephele.molgaard.org",
        "overwriteprotocol": "https",
        "overwritecondaddr": "^195\\.201\\.133\\.130$",
        "enable_previews": true,
        "updatechecker": true,
        "htaccess.RewriteBase": "\/",
        "theme": "",
        "updater.release.channel": "stable",
        "app_install_overwrite": [],
        "default_phone_region": "ISO 3166-2:DK",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "maintenance_window_start": 1
    }
}

Web server error log

Will do, when and if requested

Log file

Will do, when and if requested

Browser log

Will do, when and if requested

Additional info

I posted this at nextcloud/server#57193 December 19th, not realising that I should probably have filed it here — my apologies.

Further apologies for my tone of voice — I have elected to keep it as-is, to reflect the frustration, but will try to tone it down in subsequent correspondence.

For a long time, I have relied upon calendar reminders.

For even longer, I have failed to attend to all reminders within the same day that they were set to "fire".

As of recently, whether or not I dismiss reminders myself, they disappear, seemingly upon roll-over to the next day from the day upon which they "fired".

My assumption would be that it should not need to be said that this is antithetical to the very notion of reminders, but, apparently, such a need has now arisen.

It should be noted, however, that the possibility exists that this, new, behaviour, could be caused by client software, as opposed to Nextcloud Server itself.

In that case, the relevant clients would be Thunderbird and CalDAV connections from Android phones.

[Fjodor42]

Before realising that I had posted the issue to the wrong place, I also wrote the following comment at nextcloud/server#57193 (comment):

If anyone could point me in the direction of the general area of the code that would be responsible for this, by the way, I would be happy to try to dig into it and attempt a patch.

Also, it might be the case that this change was, indeed, intentional, in which case I shall be happy to file a feature request instead, to make it use-configurable.

[Fjodor42]

It would seem that Mozilla introduced a notification option of "Show missed reminders for writeable calendars", which, unfathomably, they decided to have defaulting to "off".

I have opened a report with them, and apologise for lashing out at you wrongly.

For people bitten by this, looking for a solution, the setting is in Settings -> Calendar -> Reminders.

[SebastianKrupinski]

Hi @Fjodor42

No worries, all good, but I am glad your issue it resolved!