Always "Out of Office"

Steps to reproduce

1. Click on Personal Settings > Groupware
2. Add an availability time range > Save > Remove it > Save
3. Got to Calendar app > New event
4. Add an attendees show busy times
5. From now on, the user schedule is fully "Out of Office"

Expected behavior

Out of office status should be removed

Actual behaviour

Availability feature seems to break the user calendar availability.
My availability settings:

My availability status:

Calendar app version

4.2.1

CalDAV-clients used

web

Browser

109.0 (64-bit)

Client operating system

macOS

Server operating system

debian Buster

Web server

Nginx

Database engine version

PostgreSQL

PHP engine version

PHP 8.1

Nextcloud version

25.0.2

Updated from an older installed version or fresh install

Fresh install

List of activated apps

Enabled:
  - activity: 2.17.0
  - admin_audit: 1.15.0
  - bruteforcesettings: 2.5.0
  - calendar: 4.2.1
  - cloud_federation_api: 1.8.0
  - contacts: 5.0.2
  - contactsinteraction: 1.6.0
  - dav: 1.24.0
  - federatedfilesharing: 1.15.0
  - files: 1.20.1
  - group_everyone: 0.1.11
  - ldap_contacts_backend: 1.5.0
  - logreader: 2.10.0
  - lookup_server_connector: 1.13.0
  - nextcloud_announcements: 1.14.0
  - notifications: 2.13.1
  - oauth2: 1.13.0
  - password_policy: 1.15.0
  - provisioning_api: 1.15.0
  - serverinfo: 1.15.0
  - settings: 1.7.0
  - side_menu: 3.5.0
  - tasks: 0.14.5
  - theming: 2.0.1
  - twofactor_backupcodes: 1.14.0
  - twofactor_totp: 7.0.0
  - twofactor_webauthn: 1.0.0
  - unroundedcorners: 1.0.8
  - updatenotification: 1.15.0
  - user_ldap: 1.15.0
  - viewer: 1.9.0
  - workflowengine: 2.7.0
Disabled:
  - circles: 24.0.0
  - comments: 1.14.0
  - dashboard: 7.4.0
  - encryption
  - event_update_notification: 2.0.0
  - federation: 1.14.0
  - files_external
  - files_pdfviewer: 2.5.0
  - files_rightclick: 1.3.0
  - files_sharing: 1.16.2
  - files_trashbin: 1.14.0
  - files_versions: 1.17.0
  - firstrunwizard: 2.13.0
  - photos: 1.6.0
  - privacy: 1.9.0
  - recommendations: 1.4.0
  - related_resources: 1.0.4
  - sharebymail: 1.14.0
  - support: 1.7.0
  - survey_client: 1.13.0
  - suspicious_login
  - systemtags: 1.14.0
  - text: 3.5.1
  - user_status: 1.4.0
  - weather_status: 1.4.0

Nextcloud configuration

{
    "system": {
        "default_phone_region": "FR",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.locking": "\\OC\\Memcache\\Memcached",
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "pgsql",
        "version": "25.0.2.3",
        "overwrite.cli.url": "***REMOVED SENSITIVE VALUE***",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "appstoreenabled": true,
        "has_internet_connection": true,
        "updater.release.channel": "stable",
        "updatechecker": false,
        "forcessl": true,
        "ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory",
        "twofactor_enforced": "true",
        "twofactor_enforced_groups": [],
        "twofactor_enforced_excluded_groups": [],
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "25",
        "defaultapp": "calendar",
        "maintenance": false,
        "theme": "",
        "loglevel": 0,
        "app_install_overwrite": [
            "ldap_contacts_backend"
        ]
    }
}

Web server error log

No response

Log file

No response

Browser log

No response

Additional info

No response

Start by reproducing the listed Personal Settings and Calendar steps in the web client, focusing on availability removal and the attendee busy-time view. Trace the availability settings and calendar availability behavior involved; done means removing the time range restores the user's availability instead of showing them as permanently out of office.