[Bug]: 28.0.2 RC5 - NC does not accept theme color changes in the administration panel

[WechuTM]

⚠️ 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

It is not possible to change the theme color in the administration panel when the "Disable user theming" option is enabled. If you turn off the "Disable user theming" option, color changes are possible. When you turn the "Disable user theming" option back on, the color returns to the default.

There is only 1 user - administrator.

Steps to reproduce

1. Go to "Administration settings" -> "Theming"
2. Turn on "Disable user theming"
3. Select new color
4. No changes
5. Turn off "Disable user theming"
6. Select new color
7. It changes
8. Turn on "Disable user theming"
9. The color returns to the default even though the displayed HEX value is different

Expected behavior

In version 27.1 the problem does not occur. The color change option should be available to the administrator regardless of the position of the "Disable user theming" function

Installation method

Official All-in-One appliance

Nextcloud Server version

28

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.1

Web server

Apache (supported)

Database engine version

MySQL

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

Updated from a MINOR version (ex. 22.1 to 22.2)

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": [
            "localhost",
            "files.domain.tld:6443",
            "10.0.0.63",
            "10.0.0.65",
            "hostname"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "28.0.2.4",
        "overwrite.cli.url": "https:\/\/10.0.0.63",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "filelocking.enabled": "true",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0,
            "dbindex": 0,
            "timeout": 1.5
        },
        "mail_smtpdebug": true,
        "mail_smtpmode": "smtp",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_smtptimeout": 30,
        "maintenance": false,
        "maintenance_window_start": 100,
        "theme": "",
        "loglevel": 2,
        "updater.release.channel": "beta",
        "app_install_overwrite": [
            "files_downloadactivity",
            "admin_notifications",
            "occweb",
            "nextant",
            "activitylog",
            "files_readmemd",
            "files_trackdownloads",
            "apporder",
            "breezedark",
            "file_upload_notification",
            "files_rightclick",
            "pdfdraw",
            "emlviewer",
            "dicomviewer",
            "imageconverter",
            "files_linkeditor",
            "metadata"
        ],
        "defaultapp": "files",
        "default_phone_region": "PL",
        "activity_expire_days": 365,
        "activity_use_cached_mountpoints": true,
        "simpleSignUpLink.shown": false,
        "enforce_theme": "breezedark",
        "updater.secret": "***REMOVED SENSITIVE VALUE***"
    }
}

List of activated Apps

Enabled:
  - activity: 2.20.0
  - admin_audit: 1.18.0
  - analytics: 4.12.0
  - apporder: 0.15.0
  - breezedark: 27.0.0
  - cloud_federation_api: 1.11.0
  - comments: 1.18.0
  - contacts: 5.5.1
  - contactsinteraction: 1.9.0
  - dav: 1.29.1
  - dicomviewer: 1.2.5
  - federatedfilesharing: 1.18.0
  - files: 2.0.0
  - files_accesscontrol: 1.18.0
  - files_external: 1.20.0
  - files_linkeditor: 1.1.16
  - 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
  - imageconverter: 1.3.5
  - logreader: 2.13.0
  - lookup_server_connector: 1.16.0
  - nextcloud_announcements: 1.17.0
  - notes: 4.9.2
  - 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
  - quota_warning: 1.18.0
  - related_resources: 1.3.0
  - serverinfo: 1.18.0
  - settings: 1.10.1
  - side_menu: 3.11.5
  - support: 1.11.0
  - survey_client: 1.16.0
  - tasks: 0.15.0
  - text: 3.9.1
  - theming: 2.3.0
  - twofactor_backupcodes: 1.17.0
  - updatenotification: 1.18.0
  - user_usage_report: 1.12.0
  - viewer: 2.2.0
  - workflowengine: 2.10.0
Disabled:
  - admin_notifications: 1.0.2 (installed 1.0.2)
  - analytics_sourcepack: 0.0.2 (installed 0.0.2)
  - backup: 1.4.0 (installed 1.4.0)
  - bruteforcesettings: 2.8.0
  - cadviewer: 9.40.6 (installed 9.40.6)
  - calendar: 4.6.4 (installed 4.6.4)
  - camerarawpreviews: 0.8.4 (installed 0.8.4)
  - circles: 28.0.0-dev (installed 28.0.0-dev)
  - dashboard: 7.8.0 (installed 7.8.0)
  - encryption: 2.16.0
  - federation: 1.18.0 (installed 1.18.0)
  - file_upload_notification: 0.1.2 (installed 0.1.2)
  - files_readmemd: 2.0.1 (installed 2.0.1)
  - files_rightclick: 0.15.1 (installed 0.15.1)
  - files_trackdownloads: 1.11.0 (installed 1.11.0)
  - firstrunwizard: 2.17.0 (installed 2.17.0)
  - metadata: 0.19.0 (installed 0.19.0)
  - recommendations: 2.0.0 (installed 2.0.0)
  - sharebymail: 1.18.0 (installed 1.18.0)
  - suspicious_login: 6.0.0
  - systemtags: 1.18.0 (installed 1.18.0)
  - twofactor_totp: 10.0.0-beta.2
  - user_ldap: 1.19.0
  - user_status: 1.8.1 (installed 1.8.1)
  - weather_status: 1.8.0 (installed 1.8.0)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

No response

Additional info

No response

[WechuTM]

I found the culprit - breezedark version 27.0.0 . After disabling the application, the problem disappeared.