Public holidays don't show up on sundays

Steps to reproduce

1. Find a public holiday that occurs on sunday
2. Go to the date of that holiday in the calendar
3. Switch to week view
4. Holiday isn't shown

Expected behavior

The holiday should appear in the calendar

Actual behaviour

The holiday doesn't appear in the calendar

Calendar app version

4.7.6

CalDAV-clients used

Nextcloud web

Browser

Brave Browser 1.67.116, Firefox 127

Client operating system

Arch Linux

Server operating system

Ubuntu Server 22.04

Web server

Apache

Database engine version

MySQL

PHP engine version

PHP 8.2

Nextcloud version

28.0.6

Updated from an older installed version or fresh install

Updated from an older version

List of activated apps

Enabled:
  - activity: 2.20.0
  - calendar: 4.7.6
  - circles: 28.0.0
  - cloud_federation_api: 1.11.0
  - comments: 1.18.0
  - contacts: 5.5.3
  - contactsinteraction: 1.9.0
  - cookbook: 0.11.0
  - dashboard: 7.8.0
  - dav: 1.29.1
  - 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: 4.2.4
  - groupfolders: 16.0.6
  - health: 2.2.2
  - integration_mastodon: 2.0.5
  - jitsi: 0.18.0
  - logreader: 2.13.0
  - lookup_server_connector: 1.16.0
  - mail: 3.6.1
  - maps: 1.4.0
  - money: 0.26.1
  - nextcloud_announcements: 1.17.0
  - notes: 4.10.0
  - notifications: 2.16.0
  - oauth2: 1.16.3
  - password_policy: 1.18.0
  - photos: 2.4.0
  - privacy: 1.12.0
  - provisioning_api: 1.18.0
  - recognize: 6.1.1
  - recommendations: 2.0.0
  - related_resources: 1.3.0
  - richdocuments: 8.3.7
  - richdocumentscode: 24.4.201
  - riotchat: 0.17.2
  - serverinfo: 1.18.0
  - settings: 1.10.1
  - sharebymail: 1.18.0
  - spreed: 18.0.8
  - 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
  - twofactor_backupcodes: 1.17.0
  - uppush: 1.4.3
  - user_status: 1.8.1
  - viewer: 2.2.0
  - weather_status: 1.8.0
  - workflowengine: 2.10.0
Disabled:
  - admin_audit: 1.18.0
  - bruteforcesettings: 2.8.0
  - documentserver_community: 0.1.15 (installed 0.1.15)
  - encryption: 2.16.0
  - files_external: 1.20.0
  - files_rightclick: 0.15.1 (installed 1.6.0)
  - fileslibreofficeedit: 1.1.0 (installed 1.1.0)
  - officeonline: 2.1.0 (installed 2.1.0)
  - phonetrack: 0.7.7 (installed 0.7.7)
  - suspicious_login: 6.0.0
  - twofactor_totp: 10.0.0-beta.2
  - user_ldap: 1.19.0

Nextcloud configuration

{
    "system": {
        "apps_paths": [
            {
                "path": "\/snap\/nextcloud\/current\/htdocs\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/snap\/nextcloud\/current\/nextcloud\/extra-apps",
                "url": "\/extra-apps",
                "writable": true
            }
        ],
        "supportedDatabases": [
            "mysql"
        ],
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.local": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0
        },
        "log_type": "file",
        "logfile": "\/var\/snap\/nextcloud\/current\/logs\/nextcloud.log",
        "logfilemode": 416,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "10.0.1.152",
            "redacted for privacy",
            "nextcloud.box"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "28.0.6.1",
        "overwrite.cli.url": "http:\/\/10.0.1.152",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "maintenance": false,
        "app_install_overwrite": [
            "mindmap_app",
            "documents",
            "ocsms"
        ],
        "loglevel": 2,
        "theme": "",
        "maintenance_window_start": 1
    }
}

Web server error log

No response

Log file

No response

Browser log

No response

Additional info

Holidays on sunday do show up on my phone with the built-in calendar app even with the same public holiday calendar.

Start by reproducing the missing Sunday holiday in the Nextcloud Calendar web app, comparing week view with the phone calendar behavior. Trace the calendar's holiday rendering and week-view entry points to find where Sunday events are omitted. Done means public holidays occurring on Sunday appear in the web calendar's week view.