[Bug]: Nextcloud Notes not respecting spelling

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Nextcloud: v 28.0.3
Notes: v 4.9.4
Language: English (British English)
Locale: English (Australia)
The spelling appears to be US focused - 'z' being offered to replace 's' as an example. Not all of us agree with Noah Webster's Blue Book :)

Steps to reproduce

Normal use of Notes with Language and Locale as stated above

Expected behavior

Spelling should align with Language and/or Locale

Installation method

Community Web installer on a VPS or web space

Nextcloud Server version

28

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.2

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

Fresh Nextcloud Server install

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

sudo -u www-data php occ config:list system
{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "10.2.2.250",
            "howard.id.au"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "28.0.3.2",
        "overwrite.cli.url": "http:\/\/10.2.2.250\/nextcloud",
        "installed": true,
        "updater.secret": "***REMOVED SENSITIVE VALUE***",
        "maintenance": false,
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "loglevel": 3,
        "version_retention_obligation": "auto, 30",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "25",
        "mail_smtpsecure": "ssl"
    }
}

List of activated Apps

sudo -u www-data php occ app:list
Enabled:
  - activity: 2.20.0
  - calendar: 4.6.7
  - circles: 28.0.0-dev
  - cloud_federation_api: 1.11.0
  - comments: 1.18.0
  - contactsinteraction: 1.9.0
  - 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
  - logreader: 2.13.0
  - lookup_server_connector: 1.16.0
  - nextcloud_announcements: 1.17.0
  - notes: 4.9.4
  - 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
  - related_resources: 1.3.0
  - richdocuments: 8.3.3
  - serverinfo: 1.18.0
  - settings: 1.10.1
  - sharebymail: 1.18.0
  - spreed: 18.0.5
  - support: 1.11.0
  - survey_client: 1.16.0
  - systemtags: 1.18.0
  - text: 3.9.1
  - theming: 2.3.0
  - twofactor_backupcodes: 1.17.0
  - updatenotification: 1.18.0
  - viewer: 2.2.0
  - weather_status: 1.8.0
  - workflowengine: 2.10.0
Disabled:
  - admin_audit: 1.18.0
  - bruteforcesettings: 2.8.0
  - encryption: 2.16.0
  - files_external: 1.20.0
  - fileslibreofficeedit: 1.1.0 (installed 1.1.0)
  - integration_collaboard: 1.0.6 (installed 1.0.6)
  - recommendations: 2.0.0 (installed 2.0.0)
  - suspicious_login: 6.0.0
  - twofactor_totp: 10.0.0-beta.2
  - user_ldap: 1.19.0
  - user_status: 1.8.1 (installed 1.8.1)

Nextcloud Signing status

http://howard.id.au/nextcloud/index.php/settings/integrity/failed

No errors have been found.

Nextcloud Logs

Nil

Additional info

Nil

Start by reproducing the spelling suggestions in the Nextcloud Notes app with English (British English) and English (Australia) configured, using the reported Notes 4.9.4 and Nextcloud 28.0.3 versions. Trace how Notes obtains the language or locale for spell checking; done means suggestions follow the selected language or locale rather than always using US spelling.