Deck board task not showing color bullet on month view

Steps to reproduce

1. Create a Deck board and add task to it with a date.
2. Go to Calendar. The new Deck board appears with default color.
3. The task is showing at month view, but without the assigned color bullet (the color is assigned by calendar app, i guess).
4. No matter what color you set at calendar app to that Calendar, is not showing.
5. In other views (week, day...) the color is showing.
   
   

Expected behavior

The bullet with calendar color must be shown at task event.

Actual behaviour

The bullet with color is not showing.

Calendar app version

4.7.3

CalDAV-clients used

No response

Browser

Google Chrome 124

Client operating system

Linux Mint

Server operating system

Debian 12

Web server

Nginx

Database engine version

MariaDB

PHP engine version

PHP 8.2

Nextcloud version

28.0.5

Updated from an older installed version or fresh install

Updated from an older version

List of activated apps

Enabled:
  - activity: 2.20.0
  - analytics: 4.13.0
  - announcementcenter: 6.8.1
  - bruteforcesettings: 2.8.0
  - calendar: 4.7.3
  - circles: 28.0.0
  - cloud_federation_api: 1.11.0
  - comments: 1.18.0
  - contacts: 5.5.3
  - contactsinteraction: 1.9.0
  - dav: 1.29.1
  - deck: 1.12.2
  - external: 5.3.1
  - federatedfilesharing: 1.18.0
  - federation: 1.18.0
  - files: 2.0.0
  - files_pdfviewer: 2.9.0
  - files_reminders: 1.1.0
  - files_sharing: 1.20.0
  - files_trashbin: 1.18.0
  - files_versions: 1.21.0
  - firstrunwizard: 2.17.0
  - forms: 4.2.3
  - groupfolders: 16.0.6
  - iametzaht: 0.0.3
  - impersonate: 1.15.0
  - integration_deepl: 1.1.3
  - integration_openai: 2.0.1
  - logreader: 2.13.0
  - lookup_server_connector: 1.16.0
  - nextcloud_announcements: 1.17.0
  - notes: 4.10.0
  - notifications: 2.16.0
  - oauth2: 1.16.3
  - onlyoffice: 9.2.0
  - password_policy: 1.18.0
  - polls: 7.0.3
  - privacy: 1.12.0
  - provisioning_api: 1.18.0
  - recommendations: 2.0.0
  - related_resources: 1.3.0
  - serverinfo: 1.18.0
  - settings: 1.10.1
  - sharebymail: 1.18.0
  - sharelisting: 1.2.0
  - side_menu: 3.12.0
  - spreed: 18.0.7
  - support: 1.11.1
  - survey_client: 1.16.0
  - systemtags: 1.18.0
  - tasks: 0.16.0
  - text: 3.9.1
  - theming: 2.3.0
  - timetracker: 0.0.82
  - twofactor_backupcodes: 1.17.0
  - updatenotification: 1.18.0
  - user_status: 1.8.1
  - viewer: 2.2.0
  - weather_status: 1.8.0
  - workflowengine: 2.10.0
Disabled:
  - admin_audit: 1.18.0
  - apporder: 0.15.0 (installed 0.15.0)
  - cfg_share_links: 5.0.0 (installed 5.0.0)
  - dashboard: 7.8.0 (installed 7.8.0)
  - encryption: 2.16.0
  - files_external: 1.20.0
  - files_linkeditor: 1.1.17 (installed 1.1.17)
  - files_markdown: 2.4.1 (installed 2.4.1)
  - files_rightclick: 0.15.1 (installed 1.6.0)
  - mail: 3.5.8 (installed 3.5.8)
  - photos: 2.4.0 (installed 2.4.0)
  - richdocuments: 8.3.3 (installed 8.3.3)
  - suspicious_login: 6.0.0
  - twofactor_totp: 10.0.0-beta.2
  - user_ldap: 1.19.0

Nextcloud configuration

{
    "system": {
        "htaccess.RewriteBase": "\/",
        "apps_paths": [
            {
                "path": "\/var\/www\/html\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/custom_apps",
                "url": "\/custom_apps",
                "writable": true
            }
        ],
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "password": "***REMOVED SENSITIVE VALUE***",
            "port": 6379
        },
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "nextcloud-demo.iametza.eus"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "28.0.5.1",
        "overwrite.cli.url": "http:\/\/nextcloud-demo.iametza.eus",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "default_language": "eu",
        "default_locale": "eu",
        "default_phone_region": "ES",
        "loglevel": 0,
        "maintenance": false,
        "allow_local_remote_servers": true,
        "overwriteprotocol": "https",
        "mail_smtpmode": "smtp",
        "mail_smtpsecure": "tls",
        "mail_sendmailmode": "smtp",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "app_install_overwrite": [
            "richdocuments",
            "mugarriak",
            "impersonate",
            "files_markdown",
            "apporder",
            "sharelisting",
            "files_linkeditor"
        ],
        "theme": "",
        "defaultapp": "files"
    }
}

Web server error log

No response

Log file

No response

Browser log

No response

Additional info

No response

Reproduce the Deck task in Calendar's month view, then compare its rendering with the week and day views. Trace the month-view task event display and its calendar-color bullet handling; done means the assigned color bullet appears in month view as it already does in the other views.