Set default sharing permission for public shares

⚠️ This issue respects the following points: ⚠️

• 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.

Description

The "Default share permissions" does not seem to be working.
Maybe I just don't understand what it is supposed to do.

I am not sure I understand the following line from the documentation

With Default share permissions you are able to set the default permissions for user-shares (Create, Change, Delete and Reshare) without forcing them.

Does it mean that existing link permissions won't change, but new link will have the default permission set ? If yes, this is what I expect.

Steps to reproduce

1. Go to Settings -> Administration Settings -> Sharing
2. Check all the check-boxes under "Default share permissions"
   
3. Go to the file explorer
4. Create a new link, and then open the link settings
   

Expected behavior

I would expect that the new link is created with the default permission that are set in the Administration Settings

Installation method

Community Manual installation with Archive

Nextcloud Server version

25

Operating system

Debian/Ubuntu

PHP engine version

PHP 7.4

Web server

Nginx

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": {
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost",
            "test3.girofle.cloud"
        ],
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "25.0.2.3",
        "overwrite.cli.url": "https:\/\/test3.girofle.cloud",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "default_language": "fr",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "default_phone_region": "fr",
        "maintenance": false,
        "loglevel": 2,
        "upgrade.disable-web": "true"
    }
}

List of activated Apps

Enabled:
  - activity: 2.17.0
  - calendar: 4.2.0
  - circles: 25.0.0
  - cloud_federation_api: 1.8.0
  - comments: 1.15.0
  - contactsinteraction: 1.6.0
  - dashboard: 7.5.0
  - dav: 1.24.0
  - federatedfilesharing: 1.15.0
  - federation: 1.15.0
  - files: 1.20.1
  - files_pdfviewer: 2.6.0
  - files_rightclick: 1.4.0
  - files_sharing: 1.17.0
  - files_trashbin: 1.15.0
  - files_versions: 1.18.0
  - logreader: 2.10.0
  - lookup_server_connector: 1.13.0
  - nextcloud_announcements: 1.14.0
  - notifications: 2.13.1
  - notify_push: 0.5.2
  - oauth2: 1.13.0
  - onlyoffice: 7.6.8
  - password_policy: 1.15.0
  - photos: 2.0.1
  - privacy: 1.9.0
  - provisioning_api: 1.15.0
  - recommendations: 1.4.0
  - related_resources: 1.0.3
  - serverinfo: 1.15.0
  - settings: 1.7.0
  - sharebymail: 1.15.0
  - spreed: 15.0.3
  - support: 1.8.0
  - survey_client: 1.13.0
  - systemtags: 1.15.0
  - text: 3.6.0
  - theming: 2.0.1
  - twofactor_backupcodes: 1.14.0
  - updatenotification: 1.15.0
  - user_status: 1.5.0
  - viewer: 1.9.0
  - weather_status: 1.5.0
  - workflowengine: 2.7.0
Disabled:
  - admin_audit
  - bruteforcesettings
  - encryption
  - files_external
  - suspicious_login
  - twofactor_totp
  - user_ldap

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

No response

Additional info

No response

Reproduce the behavior using Administration Settings → Sharing and the file explorer steps described in the issue. Trace how the configured default share permissions are applied when a new public link is created, and verify whether existing link permissions remain unchanged. Done means the documented expected behavior is confirmed or the discrepancy is covered by a regression test.