Guests App breaks occ group listing

[rlke42]

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Steps to reproduce

1. Install Guests app and create a guest user
2. Use occ group:list <pattern> to search for members of groups

Expected behaviour

Only the group matching the <pattern> should be returned, as documented for group:list

Actual behaviour

The command returns all groups matching the <pattern> (may be none) and always the group guest_app.

{
    "<GroupID>": {
        "displayName": "<GroupName>",
        "backends": [
            "Database"
        ],
        "users": [
            "examplegroupmember1",
            "examplegroupmember2"
        ]
    },
    "guest_app": {
        "displayName": "Guests",
        "backends": [
            "OCA\\Guests\\GroupBackend"
        ],
        "users": [
            "user@maildomain.example"
        ]
    }
}

The behaviour is the same for all output modes (plain, json, json_pretty) and differing patterns.
I do not have other group backends, as such I cannot test if the problem lies in the backend or occ command implementation.

Server configuration

Web server: Caddy + PHP-FPM (nextcloud docker)

Database: PostgreSQL

PHP version: 8.3.28

Nextcloud version: 32.0.2

List of activated apps

  - activity: 5.0.0-dev.0
  - assistant: 2.11.0
  - bookmarks: 16.0.1
  - bruteforcesettings: 5.0.0-dev.0
  - calendar: 6.1.1
  - circles: 32.0.0
  - cloud_federation_api: 1.16.0
  - collectives: 3.4.0
  - comments: 1.22.0
  - contacts: 8.1.1
  - contactsinteraction: 1.13.1
  - dashboard: 7.12.0
  - dav: 1.34.2
  - drawio: 3.1.2
  - federatedfilesharing: 1.22.0
  - federation: 1.22.0
  - files: 2.4.0
  - files_antivirus: 6.1.0
  - files_automatedtagging: 3.0.1
  - files_downloadlimit: 5.0.0-dev.0
  - files_pdfviewer: 5.0.0-dev.0
  - files_reminders: 1.5.0
  - files_sharing: 1.24.1
  - files_trashbin: 1.22.0
  - files_versions: 1.25.0
  - groupfolders: 20.1.5
  - guests: 4.6.0
  - integration_openstreetmap: 3.0.0
  - logreader: 5.0.0-dev.0
  - lookup_server_connector: 1.20.0
  - memories: 7.7.0
  - metadata: 0.23.0
  - metavox: 1.1.3
  - news: 27.2.0
  - notes: 4.12.4
  - notifications: 5.0.0-dev.0
  - notify_push: 1.2.1
  - oauth2: 1.20.0
  - ownershiptransfer: 1.3.0
  - password_policy: 4.0.0-dev.0
  - photos: 5.0.0-dev.1
  - previewgenerator: 5.11.0
  - privacy: 4.0.0-dev.0
  - profile: 1.1.0
  - provisioning_api: 1.22.0
  - recognize: 10.0.6
  - recommendations: 5.0.0-dev.0
  - related_resources: 3.0.0-dev.0
  - richdocuments: 9.0.2
  - secrets: 2.1.4
  - serverinfo: 4.0.0-dev.0
  - settings: 1.15.1
  - sharebymail: 1.22.0
  - systemtags: 1.22.0
  - tables: 1.0.1
  - tasks: 0.17.1
  - text: 6.0.1
  - theming: 2.7.0
  - twofactor_backupcodes: 1.21.0
  - twofactor_nextcloud_notification: 6.0.0-dev.0
  - twofactor_totp: 14.0.0
  - updatenotification: 1.22.0
  - user_migration: 9.0.0
  - user_status: 1.12.0
  - viewer: 5.0.0-dev.0
  - weather_status: 1.12.0
  - webhook_listeners: 1.3.0
  - whiteboard: 1.4.2
  - workflowengine: 2.14.0

Nextcloud configuration

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder