Nextcloud Office does not show the Nextcloud logo and clicking the top left area fails as well

Describe the bug
The menu bar of Nextcloud Office does not look and behave as expected.

To Reproduce
Steps to reproduce the behavior:

1. Open a Nextcloud Office document.
2. See the toolbar without a Nextcloud logo left next to "File" which is a clickable area.
3. Clicking the blank area left to "File" opens an URL on the Collabora server which then shows an error message.

Expected behavior
The menu bar shows a Nextcloud logo in the top left next to "File". Clicking it will either to do nothing or open the Nextcloud default app.

Screenshots
In the past there was a Nextcloud logo in the top left corner in the past:

Now with version 25.04.8.1 (CODE running in Docker) there is no logo any longer but you can still click this spot (also note, that the “save” check mark was replaced by a disk symbol - which is confusing since all other apps like the Nextcloud text editor or Collectives also use the check mark and not a disk symbol):

The URL when clicking the top left area is in the following form:

https://<COLLABORA_URL>/browser/<SOME_ID>/cool.html?WOPISrc=https%3A%2F%2F<NEXTCLOUD_URL>%2Findex.php%2Fapps%2Frichdocuments%2Fwopi%2Ffiles%2F<ANOTHER_ID>&lang=en&closebutton=1&revisionhistory=1

This URL will then show the following error as popup:

Client details:

• OS: Windows 11
• Browser: happens with all Chrome, Firefox, Vivaldi, Edge
• Version: latest versions as of 2026-01-021
• Device: desktop

Server details

Operating system: Ubuntu 22.04

Web server: Apache 2.4.58

Database: MariaDB

PHP version: PHP 8.4

Nextcloud version: 32.0.5

Version of the richdocuments app 9.0.2

Version of Collabora Online 25.04.8.1

Configuration of the richdocuments app

{
    "apps": {
        "richdocuments": {
            "canonical_webroot": "",
            "disable_certificate_verification": "",
            "doc_format": "ooxml",
            "edit_groups": "",
            "enabled": "yes",
            "external_apps": "",
            "installed_version": "9.0.2",
            "public_wopi_url": "https:\/\/coolwsd.0x0c.de",
            "types": "filesystem,prevent_group_restriction",
            "use_groups": "",
            "wopi_allowlist": "172.17.0.1\/16",
            "wopi_url": "https:\/\/coolwsd.0x0c.de"
        }
    }
}

Start by reproducing the issue in the Nextcloud Office menu bar with the reported Nextcloud, richdocuments, and Collabora Online versions, then inspect the top-left toolbar area and the URL it opens. Done means the Nextcloud logo is shown next to “File” and clicking that area either does nothing or opens the Nextcloud default app without an error.