[Bug]: Nextcloud 32 welcome screen partially loads and blocks Nextcloud Office on iOS until user logs in via PC

⚠️ 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

I have Nextcloud 32.0.1 (deb package) and Nextcloud Office (docker).

After upgrading to Nextcloud 32.0.1 a normal user experienced that they couldn't edit a spreadsheet (or any Office) document via the iOS app: most of the screen was blocked by a white rectangle. This persisted even after killing the app. After fiddling with the app, suddenly it showed the Nextcloud 32 welcome introduction in place of the white rectangle. This lead me to believe that the welcome introduction (which is new, I think?) is loaded (or attempted loaded as it didn't really load until that one random time) when opening a document in Nextcloud Office on the iOS app, and that it keeps doing this every time (not registering that it had already been loaded previously). The user in question only uses Nextcloud via the app. I asked the user to log into Nextcloud via a PC, click through the welcome introduction, then try again to use the app. Indeed this fixed the problem.

To avoid very irritated users, I suggest that the welcome screen is not attempted loaded in this way on the app.

Steps to reproduce

1. Upgrade to/install Nextcloud 32.0.1
2. Open an office document via the iOS app before logging in on a PC
3. Observe the error

Expected behavior

The welcome message was not attempted loaded when loading an Office document in the iOS app

Nextcloud Server version

32

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

MariaDB

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

Upgraded to a MAJOR version (ex. 31 to 32)

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": [
            "odin.jido.dk",
            "sky.jido.dk"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "32.0.1.2",
        "overwrite.cli.url": "https:\/\/odin.jido.dk\/sky",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "maintenance": false,
        "maintenance_window_start": 1,
        "theme": "",
        "loglevel": 3,
        "app_install_overwrite": [
            "files_external_dropbox",
            "calendar",
            "news"
        ],
        "mail_smtpmode": "smtp",
        "mail_smtpsecure": "ssl",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "allow_local_remote_servers": true,
        "default_phone_region": "DK",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379
        },
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "enable_previews": true,
        "enabledPreviewProviders": [
            "OC\\Preview\\TXT",
            "OC\\Preview\\MarkDown",
            "OC\\Preview\\PDF",
            "OC\\Preview\\MSOfficeDoc",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\PNG",
            "OC\\Preview\\GIF",
            "OC\\Preview\\BMP",
            "OC\\Preview\\XBitmap",
            "OC\\Preview\\MP3",
            "OC\\Preview\\HEIC",
            "OC\\Preview\\Movie",
            "OC\\Preview\\MKV",
            "OC\\Preview\\MP4",
            "OC\\Preview\\AVI"
        ],
        "memories.exiftool": "\/var\/www\/jido.dk\/html\/nextcloud\/apps\/memories\/bin-ext\/exiftool-amd64-glibc",
        "memories.vod.path": "\/var\/www\/jido.dk\/html\/nextcloud\/apps\/memories\/bin-ext\/go-vod-amd64",
        "memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
        "memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
        "updater.release.channel": "stable",
        "memories.db.triggers.fcu": true,
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***"
    }
}

List of activated Apps

Enabled:
  - activity: 5.0.0-dev.0
  - app_api: 32.0.0
  - bruteforcesettings: 5.0.0-dev.0
  - calendar: 6.0.2
  - circles: 32.0.0
  - cloud_federation_api: 1.16.0
  - comments: 1.22.0
  - contacts: 8.0.4
  - contactsinteraction: 1.13.1
  - cookbook: 0.11.4
  - dashboard: 7.12.0
  - dav: 1.34.2
  - federatedfilesharing: 1.22.0
  - federation: 1.22.0
  - files: 2.4.0
  - files_downloadlimit: 5.0.0-dev.0
  - files_external: 1.24.0
  - files_lock: 32.0.0
  - files_pdfviewer: 5.0.0-dev.0
  - files_reminders: 1.5.0
  - files_sharing: 1.24.0
  - files_trashbin: 1.22.0
  - files_versions: 1.25.0
  - firstrunwizard: 5.0.0-dev.0
  - forms: 5.2.2
  - groupfolders: 20.1.2
  - integration_homeassistant: 0.0.7
  - logreader: 5.0.0-dev.0
  - lookup_server_connector: 1.20.0
  - mail: 5.5.11
  - mail_roundcube: 1.2.2
  - memories: 7.7.0
  - news: 27.0.1
  - nextcloud_announcements: 4.0.0-dev.0
  - notes: 4.12.3
  - notifications: 5.0.0-dev.0
  - oauth2: 1.20.0
  - password_policy: 4.0.0-dev.0
  - photos: 5.0.0-dev.1
  - polls: 8.5.0
  - previewgenerator: 5.10.0
  - privacy: 4.0.0-dev.0
  - profile: 1.1.0
  - provisioning_api: 1.22.0
  - recognize: 10.0.4
  - recommendations: 5.0.0-dev.0
  - related_resources: 3.0.0-dev.0
  - richdocuments: 9.0.1
  - serverinfo: 4.0.0-dev.0
  - settings: 1.15.1
  - sharebymail: 1.22.0
  - spreed: 22.0.1
  - support: 4.0.0-dev.0
  - survey_client: 4.0.0-dev.0
  - suspicious_login: 10.0.0-dev.0
  - systemtags: 1.22.0
  - tasks: 0.17.0
  - 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_status: 1.12.0
  - viewer: 5.0.0-dev.0
  - weather_status: 1.12.0
  - webhook_listeners: 1.3.0
  - workflowengine: 2.14.0
Disabled:
  - admin_audit: 1.22.0
  - checksum: 1.2.6 (installed 1.2.6)
  - encryption: 2.20.0
  - imageconverter: 2.0.5 (installed 2.0.5)
  - maps: 1.6.0 (installed 1.6.0)
  - user_ldap: 1.23.0

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

Additional info

The blank rectangle:

The only once and suddenly appearing welcome message:

Reproduce the issue on the iOS app with a Nextcloud 32.0.1 server and an Office document, before the user completes the welcome introduction on a PC. Trace the iOS Office-document opening flow and welcome-screen handling; done means the welcome screen no longer blocks Office documents for users who have not logged in on a PC.