"+ Event" button always defaults to current date even if display is a different date

Steps to reproduce

1. Chose a date in the future and view the calendar
2. Click '+ Event' button

Expected behavior

The new event should have the displayed date which is the way every other calendaring program does.

Actual behavior

Observe the start and end dates being set to the current date vs the displayed date

Calendar app version

5.0.9

CalDAV-clients used

No response

Browser

Firefox 134.0.1, Qutebrowser v3.4.0

Client operating system

NixOS x86_64, unstable

Server operating system

Docker image on Arch

Web server

Nginx

Database engine version

MariaDB

PHP engine version

Other

Nextcloud version

Nextcloud Hub 9 (30.0.5)

Updated from an older installed version or fresh install

Updated from an older version

List of activated apps

- activity: 3.0.0
  - app_api: 4.0.5
  - bruteforcesettings: 3.0.0
  - calendar: 5.0.9
  - cloud_federation_api: 1.13.0
  - contacts: 6.1.3
  - contactsinteraction: 1.11.0
  - dashboard: 7.10.0
  - dav: 1.31.1
  - dav_push: 0.0.1
  - federatedfilesharing: 1.20.0
  - files: 2.2.0
  - files_downloadlimit: 3.0.0
  - files_trashbin: 1.20.1
  - files_versions: 1.23.0
  - firstrunwizard: 3.0.0
  - integration_mastodon: 3.0.1
  - logreader: 3.0.0
  - lookup_server_connector: 1.18.0
  - mail: 4.1.2
  - nextcloud_announcements: 2.0.0
  - notifications: 3.0.0
  - oauth2: 1.18.1
  - password_policy: 2.0.0
  - photos: 3.0.2
  - privacy: 2.0.0
  - provisioning_api: 1.20.0
  - serverinfo: 2.0.0
  - settings: 1.13.0
  - theming: 2.5.0
  - twofactor_backupcodes: 1.19.0
  - user_status: 1.10.0
  - viewer: 3.0.0
  - weather_status: 1.10.0
  - webhook_listeners: 1.1.0-dev
  - workflowengine: 2.12.0

Nextcloud configuration

{
    "system": {
        "debug": false,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "cloud.trex-halfbeak.ts.net"
        ],
        "dbtype": "mysql",
        "version": "30.0.5.1",
        "overwrite.cli.url": "https:\/\/cloud.trex-halfbeak.ts.net",
        "overwriteprotocol": "https",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "default_phone_region": "us",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "maintenance": false,
        "maintenance_window_start": 1,
        "theme": "",
        "loglevel": 2,
        "filelocking.enabled": "true",
        "memcache.locking": "\\OC\\Memcache\\APCu",
        "updater.secret": "***REMOVED SENSITIVE VALUE***",
        "upgrade.disable-web": true,
        "app_install_overwrite": [
            "calendar",
            "contacts"
        ]
    }
}

Web server error log

Log file

Browser log

Additional info

Addition info: PHP 8.3.15

Reproduce the issue by selecting a future date in the calendar and using the “+ Event” button, then trace that button’s entry point and the date passed to the new-event form. Done means the form uses the displayed calendar date rather than the current date, with the behavior verified for a future date.