Cannot use a Templates folder within a Groupfolder

Describe the bug
A Template folder created within a groupfolder (and set as the Template location) does not work as expected and doesn't suggest templates when creating new files. Instead, no templates are suggested.

To Reproduce
Steps to reproduce the behavior:

1. Set up stock nextcloud 24.0.8
2. Login as admin
3. Go to https://nextcloud.example.com/settings/users
4. Create a group (e.g. computers)
5. Create a regular user (e.g., dorothyvaughan)
6. Add the new user to the new group.
7. Install the Nextcloud Office app (v6.3.6)
8. Install the Group Folders app (v12.0.3)
9. Go to https://nextcloud.example.com/settings/admin/richdocuments
10. Select a demo Collabora server.
    
11. Go to https://nextcloud.example.com/settings/admin/groupfolders
12. Create a new groupfolder (e.g. Computers) and give the admin and computers` group full access.
13. Login as test user
14. Navigate to new groupfolder.
15. Inside, set up a Templates folder by selecting the + and then Set up templates folder and naming Templates
16. Inside the Templates folder, create a test Template .docx document.
17. Under [Profile] > Settings > Office, Choose the location of the templates folder you just set up.
18. Navigate back to the user's home folder and attempt to create a new .docx
19. No Templates are offered to the user.

Expected behavior
I expect that users can use any location they have access to to set up a Templates folder, even if this is group folder. (Creating a templates folder outside of groupfolders and setting that location under settings does work as expected.)

Screenshots

Client details:

• OS: Arch Linux
• Browser: Mozilla Firefox , Chromium
• Version: 112.0.2 , 113.0.5672.63
• Device: Desktop/web

Server details

Operating system: Alpine

Web server: nginx/1.23.2

Database: mariadb Ver 15.1 Distrib 10.8.7-MariaDB, for Linux

PHP version: PHP 8.1.13 (cli) (built: Nov 23 2022 13:29:46) (NTS)

Nextcloud version: 24.0.8.2

Version of the richdocuments app v6.3.6

Version of Collabora Online Not sure what the demo server is running, but I was also able to replicate on Collabora Online 22.05.12-4

The logs show that I haven't configured the smtp yet to send activity/account activation emails to dorothy.

I also haven't configured a clamAV instance yet, so there are warnings about that.

Please let me know what other information I can provide.

The report names the Office settings, groupfolder location, and template-creation flow, but no source file or test. Start by reproducing the steps with a template stored in a groupfolder, then trace the richdocuments handling of that configured location. Done means a user can create a new document and receive templates from an accessible groupfolder.