[Bug]: Checksum recorded in file cache not copied when file is copied

⚠️ 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

When a checksum is recorded in the file cache for a file, that checksum is not included in the file metadata that is duplicated for the new file cache records when the file is copied. Size, timestamps, mime type, etc. are all duplicated, but not the previously recorded checksum.

Steps to reproduce

1. Upload a file using a client that reports the checksum of the file on upload.
2. Copy the file to another location within Nextcloud using either the UI or WebDAV.
3. The file cache metadata for the new copy does not include the previously recorded checksum.

Expected behavior

The file cache metadata for the new copy would include the previously recorded checksum.

Nextcloud Server version

31

Operating system

RHEL/CentOS

PHP engine version

PHP 8.3

Web server

Apache (supported)

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?

None

What user-backends are you using?

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

Configuration report

{
    "system": {
        "debug": false,
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***",
            "***REMOVED SENSITIVE VALUE***"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "logfile":  "***REMOVED SENSITIVE VALUE***",
        "loglevel": 0,
        "log_rotate_size": 0,
        "loglevel_dirty_database_queries": 1,
        "overwrite.cli.url":  "***REMOVED SENSITIVE VALUE***",
        "dbtype": "pgsql",
        "version": "31.0.2.1",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "htaccess.RewriteBase": "\/",
        "knowledgebaseenabled": false,
        "auth.bruteforce.protection.enabled": false,
        "skeletondirectory": "",
        "updatechecker": false,
        "appstoreenabled": false,
        "enable_previews": false,
        "cron_log": true,
        "maintenance": false,
        "maintenance_window_start": 1,
        "integrity.check.disabled": true,
        "mail_sendmailmode": "smtp",
        "mail_smtpmode": "sendmail",
        "mail_smtpauthtype": "PLAIN",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "sharing.enable_autocomplete": false,
        "sharing.minSearchStringLength": 99,
        "sharing.maxAutocompleteResults": 0,
        "session_lifetime": 31536000,
        "session_keepalive": true,
        "remember_login_cookie_lifetime": 31536000,
        "localstorage.allowsymlinks": true,
        "apps_paths": [
            {
                "path": "***REMOVED SENSITIVE VALUE***",
                "url": "\/apps",
                "writable": true
            }
        ],
        "gs.enabled": false,
        "app_install_overwrite": [
            "ida"
        ],
        "filelocking.enabled": true,
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.local": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379
        },
        "theme": "ida",
        "config_is_read_only": true,
        "default_language": "en",
        "default_locale": "fi_FI",
        "default_phone_region": "FI",
        "reduce_to_languages": [
            "en",
            "fi",
            "sv"
        ],
        "default_timezone": "UTC",
        "knowledgebase.embedded": false,
        "enable_avatars": false,
        "allow_user_to_change_display_name": false,
        "logtimezone": "UTC",
        "logdateformat": "Y-m-d\\TH:i:s\\Z"
    }
}

List of activated Apps

Enabled:
  - admin_audit: 1.21.0
  - app_api: 5.0.2
  - cloud_federation_api: 1.14.0
  - dav: 1.33.0
  - federatedfilesharing: 1.21.0
  - files: 2.3.1
  - files_sharing: 1.23.1
  - ida: 3
  - lookup_server_connector: 1.19.0
  - oauth2: 1.19.1
  - profile: 1.0.0
  - provisioning_api: 1.21.0
  - settings: 1.14.0
  - theming: 2.6.1
  - twofactor_backupcodes: 1.20.0
  - viewer: 4.0.0
  - workflowengine: 2.13.0
Disabled:
  - activity: 4.0.0 (installed 4.0.0)
  - bruteforcesettings: 4.0.0 (installed 4.0.0)
  - circles: 31.0.0 (installed 31.0.0)
  - comments: 1.21.0 (installed 1.21.0)
  - contactsinteraction: 1.12.0 (installed 1.12.0)
  - dashboard: 7.11.0 (installed 7.11.0)
  - encryption: 2.19.0
  - federation: 1.21.0 (installed 1.21.0)
  - files_downloadlimit: 4.0.0 (installed 4.0.0)
  - files_external: 1.23.0
  - files_pdfviewer: 4.0.0 (installed 4.0.0)
  - files_reminders: 1.4.0 (installed 1.4.0)
  - files_trashbin: 1.21.0 (installed 1.21.0)
  - files_versions: 1.24.0 (installed 1.24.0)
  - firstrunwizard: 4.0.0 (installed 4.0.0)
  - logreader: 4.0.0 (installed 4.0.0)
  - nextcloud_announcements: 3.0.0 (installed 3.0.0)
  - notifications: 4.0.0 (installed 4.0.0)
  - password_policy: 3.0.0 (installed 3.0.0)
  - photos: 4.0.0-dev.1 (installed 4.0.0-dev.1)
  - privacy: 3.0.0 (installed 3.0.0)
  - recommendations: 4.0.0 (installed 4.0.0)
  - related_resources: 2.0.0 (installed 2.0.0)
  - serverinfo: 3.0.0 (installed 3.0.0)
  - sharebymail: 1.21.0 (installed 1.21.0)
  - support: 3.0.0 (installed 3.0.0)
  - survey_client: 3.0.0 (installed 3.0.0)
  - suspicious_login: 9.0.1
  - systemtags: 1.21.1 (installed 1.21.1)
  - text: 5.0.0 (installed 5.0.0)
  - twofactor_nextcloud_notification: 5.0.0
  - twofactor_totp: 13.0.0-dev.0
  - updatenotification: 1.21.0 (installed 1.21.0)
  - user_ldap: 1.22.0
  - user_status: 1.11.0 (installed 1.11.0)
  - weather_status: 1.11.0 (installed 1.11.0)
  - webhook_listeners: 1.2.0 (installed 1.2.0)

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

Start by tracing the file-cache metadata handling used by the upload and copy paths described in the reproduction steps. Compare which metadata fields are duplicated during a copy, then verify that the recorded checksum is retained for the new file-cache record; the issue names no specific source file or test to run.