[Bug]: `files_external:scan` not work if mountpoint have `$user` in the path

[segator]

⚠️ This issue respects the following points: ⚠️

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

Bug description

nextcloud-occ files_external:scan 1
nextcloud-occ files_external:scan 1 --user myuser

Error while trying to create storage

Steps to reproduce

1. Create external mounpoint with /homes/$user

Expected behavior

dynamically scans per user or all users if passed --user parameter

Installation method

Other Community project

Nextcloud Server version

29

Operating system

Other

PHP engine version

PHP 8.3

Web server

Nginx

Database engine version

PostgreSQL

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

Fresh Nextcloud Server install

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

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

Configuration report

{
    "system": {
        "apps_paths": [
            {
                "path": "\/nix\/store\/49ajp34cwzb19479qbhwr3188ivwvnwh-nextcloud-29.0.3-with-apps\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/nix\/store\/49ajp34cwzb19479qbhwr3188ivwvnwh-nextcloud-29.0.3-with-apps\/store-apps",
                "url": "\/store-apps",
                "writable": true
            }
        ],
        "appstoreenabled": true,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "pgsql",
        "allow_user_to_change_display_name": false,
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "default_phone_region": "ES",
        "enable_previews": true,
        "enabledPreviewProviders": [
            "OC\\Preview\\BMP",
            "OC\\Preview\\GIF",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\Krita",
            "OC\\Preview\\MarkDown",
            "OC\\Preview\\MP3",
            "OC\\Preview\\OpenDocument",
            "OC\\Preview\\PNG",
            "OC\\Preview\\TXT",
            "OC\\Preview\\XBitmap",
            "OC\\Preview\\Image",
            "OC\\Preview\\HEIC",
            "OC\\Preview\\TIFF",
            "OC\\Preview\\Movie"
        ],
        "jpeg_quality": 60,
        "localstorage.umask": "0007",
        "log_type": "file",
        "loglevel": 2,
        "lost_password_link": "disabled",
        "maintenance_window_start": 4,
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memories.exiftool": "\/nix\/store\/4cl3bqpmasgvg8c3v30w0r2w70ssgydr-perl5.38.2-Image-ExifTool-12.84\/bin\/exiftool",
        "memories.vod.ffmpeg": "\/nix\/store\/4n60lnj3zkjpasd4c56bzhpx2m8lc1sx-ffmpeg-headless-6.1.1-bin\/bin\/ffmpeg",
        "memories.vod.ffprobe": "\/nix\/store\/4n60lnj3zkjpasd4c56bzhpx2m8lc1sx-ffmpeg-headless-6.1.1-bin\/bin\/ffprobe",
        "overwriteProtocol": "http",
        "overwriteprotocol": "",
        "preview_max_filesize_image": 150,
        "preview_max_memory": 2048,
        "preview_max_x": 2048,
        "preview_max_y": 2048,
        "profile.enabled": false,
        "recognize": [],
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0
        },
        "skeletondirectory": "",
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "version": "29.0.3.4",
        "overwrite.cli.url": "http:\/\/localhost",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "memories.db.triggers.fcu": true,
        "memories.vod.path": "\/var\/lib\/nextcloud\/store-apps\/memories\/bin-ext\/go-vod-amd64",
        "memories.gis_type": 2,
        "trusted_domains": [
            "xxxxxxxxxxxxx"
        ]
    }
}

List of activated Apps

Enabled:
  - bruteforcesettings: 2.9.0
  - circles: 29.0.0-dev
  - cloud_federation_api: 1.12.0
  - contactsinteraction: 1.10.0
  - dav: 1.30.1
  - federatedfilesharing: 1.19.0
  - federation: 1.19.0
  - files: 2.1.0
  - files_downloadlimit: 2.0.0
  - files_external: 1.21.0
  - files_pdfviewer: 2.10.0
  - files_reminders: 1.2.0
  - files_sharing: 1.21.0
  - files_trashbin: 1.19.0
  - files_versions: 1.22.0
  - firstrunwizard: 2.18.0
  - logreader: 2.14.0
  - lookup_server_connector: 1.17.0
  - memories: 7.3.1
  - nextcloud_announcements: 1.18.0
  - notifications: 2.17.0
  - oauth2: 1.17.0
  - password_policy: 1.19.0
  - previewgenerator: 5.5.0
  - privacy: 1.13.0
  - provisioning_api: 1.19.0
  - recognize: 7.0.3
  - recommendations: 2.1.0
  - related_resources: 1.4.0
  - serverinfo: 1.19.0
  - settings: 1.12.0
  - sharebymail: 1.19.0
  - support: 1.12.0
  - survey_client: 1.17.0
  - suspicious_login: 7.0.0
  - systemtags: 1.19.0
  - tasks: 0.16.0
  - text: 3.10.1
  - theming: 2.4.0
  - twofactor_backupcodes: 1.18.0
  - updatenotification: 1.19.1
  - user_status: 1.9.0
  - viewer: 2.3.0
  - weather_status: 1.9.0
  - workflowengine: 2.11.0
Disabled:
  - activity: 2.21.1 (installed 2.21.1)
  - admin_audit: 1.19.0
  - comments: 1.19.0 (installed 1.19.0)
  - dashboard: 7.9.0 (installed 7.9.0)
  - encryption: 2.17.0
  - photos: 2.5.0 (installed 2.5.0)
  - twofactor_totp: 11.0.0-dev
  - user_ldap: 1.20.0

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

No response

Additional info

No response