[Bug]: Bad sharing setting caption: Allow username autocompletion to users within the same groups

⚠️ 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 (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• Nextcloud Server is running on 64bit capable CPU, PHP and OS.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Nextcloud 25.0.6
User icon -> Administration settings -> Administration/Sharing

• Allow username autocompletion in share dialogue: Checked
• Allow username autocompletion to users within the same groups: Checked

This makes users to not find some groups when trying to share a folder to. Not being member of anyone, yes it finds some groups and doesn't find some other . Although the user administers those groups.
The only workaround is to leave second option unchecked.

There are two possibilities:

• The option description is bad written
• There is a bug on user/groups search box behavior.

Steps to reproduce

1. Configure site sharing options as described
2. Create multiple groups with diverse members in them
3. From another user account, try to share a folder to each group

Expected behavior

User/groups search box should allow to select any account within same groups + any group within + any group this user administers.

Installation method

Community Web installer on a VPS or web space

Nextcloud Server version

25

Operating system

Debian/Ubuntu

PHP engine version

PHP 7.4

Web server

Apache (supported)

Database engine version

MariaDB

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

None

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

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

Configuration report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "25.0.6.1",
        "overwrite.cli.url": "https:\/\/***REMOVED SENSITIVE VALUE***",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "htaccess.RewriteBase": "\/",
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "auth.webauthn.enabled": false,
        "default_language": "es",
        "default_locale": "es_ES",
        "logtimezone": "Europe\/Madrid",
        "default_phone_region": "ES",
        "app_install_overwrite": [
            "files_ebookreader",
            "ocr",
            "dropit",
            "files_3d",
            "video_converter"
        ],
        "maintenance": false,
        "theme": "",
        "loglevel": 0,
        "simpleSignUpLink.shown": false,
        "updater.secret": "***REMOVED SENSITIVE VALUE***"
    }
}

List of activated Apps

Enabled:
  - activity: 2.17.0
  - breezedark: 25.0.2
  - bruteforcesettings: 2.5.0
  - calendar: 4.3.3
  - circles: 25.0.0
  - cloud_federation_api: 1.8.0
  - comments: 1.15.0
  - contacts: 5.2.0
  - data_request: 1.12.0
  - dav: 1.24.0
  - external: 5.0.2
  - federatedfilesharing: 1.15.0
  - federation: 1.15.0
  - files: 1.20.1
  - files_external: 1.17.0
  - files_mindmap: 0.0.27
  - files_rightclick: 1.4.0
  - files_sharing: 1.17.0
  - files_trashbin: 1.15.0
  - files_versions: 1.18.0
  - firstrunwizard: 2.14.0
  - groupfolders: 13.1.2
  - groupquota: 0.1.10
  - logreader: 2.10.0
  - lookup_server_connector: 1.13.0
  - metadata: 0.18.0
  - notifications: 2.13.1
  - oauth2: 1.13.0
  - ocr: 6.0.58
  - password_policy: 1.15.0
  - previewgenerator: 5.2.4
  - privacy: 1.9.0
  - provisioning_api: 1.15.0
  - quota_warning: 1.16.0
  - recommendations: 1.4.0
  - related_resources: 1.0.4
  - serverinfo: 1.15.0
  - settings: 1.7.0
  - sharebymail: 1.15.0
  - support: 1.8.0
  - systemtags: 1.15.0
  - terms_of_service: 2.1.0
  - text: 3.6.0
  - theming: 2.0.1
  - theming_customcss: 1.13.0
  - twofactor_backupcodes: 1.14.0
  - updatenotification: 1.15.0
  - user_external: 3.1.0
  - user_status: 1.5.0
  - video_converter: 1.0.5
  - viewer: 1.9.0
  - weather_status: 1.5.0
  - workflowengine: 2.7.0
Disabled:
  - admin_audit
  - audioplayer: 3.3.1
  - contactsinteraction: 1.4.0
  - dashboard: 7.0.0
  - deck: 1.8.3
  - encryption
  - extract: 1.3.5
  - files_pdfviewer: 2.3.1
  - gpgmailer: 0.0.4
  - impersonate: 1.12.0
  - mail: 2.2.6
  - nextcloud_announcements: 1.9.0
  - photos: 1.2.0
  - registration: 2.1.0
  - richdocuments: 7.1.3
  - richdocumentscode: 22.5.1301
  - sharepermissions: 1.0.1
  - sharingpath: 0.4.4
  - socialsharing_diaspora: 2.5.0
  - socialsharing_email: 2.5.0
  - spreed: 15.0.5
  - survey_client: 1.8.0
  - suspicious_login
  - tasks: 0.14.5
  - twofactor_totp
  - user_ldap

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

No response

Additional info

No response

Start by reproducing the behavior from Administration/Sharing with several groups and users, then trace the user/groups search box flow described in the report. Compare the caption with the expected visibility for accounts, same-group users, groups, and groups administered by the user. Done means the behavior matches the clarified option description or the search results include the expected accounts and groups, with regression coverage if the relevant tests are found.