[Bug]: Team folders (Groupfolders) are not automatically synced

### ⚠️ Before submitting, please verify the following: ⚠️

- [x] This is a **bug**, not a question or a configuration issue.
- [x] This issue is **not** already reported on Github (I've searched it).
- [x] Nextcloud Server and Desktop Client are **up to date**. See [Server Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) and [Desktop Releases](https://nextcloud.com/install/#install-clients) for supported versions.
- [x] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/)

### Bug description

When the desktop client is set to automatically sync external shares, like team folders, when a new teamfolder is shared, the folder appears in the GUI of the client as synced but is actually not. The client doesn't initiate the download until the folder is manually deactivated and reactivated to be synced.

### Steps to reproduce

1. Configure the desktop client to not ask for permission to sync external shares
2. As admin create a new team folder and share it with a group of which you are a member
3. Check that the folder is visible in the GUI of the desktop client and marked to be synced
4. Check the Nextcloud folder if the folder is present
5. The folder is not present.
6. Go to client GUI and uncheck the folder and check it again.
7. Check if the folder is now present in the Nextcloud folder
8. Folde is now present
...

### Expected behavior

Since the folder was automatically marked to by synced, the folder should be automatically synced and visible in the file explorer.

### Which files are affected by this bug

team folders and their content

### Operating system

Windows

### Which version of the operating system you are running.

Windows 11, Windows 10, Linux

### Package

Official Windows MSI

### Nextcloud Server version

31.0.9

### Nextcloud Desktop Client version

4.0.0

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

Fresh desktop client install

### Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

### Are you using an external user-backend?

- [ ] Default internal user-backend
- [ ] LDAP/ Active Directory
- [ ] SSO - SAML
- [ ] Other

### Nextcloud Server logs

```shell
There are no errors logged on the server.
```

### Additional info

[__nextcloud_client_buildinfo.txt](https://github.com/user-attachments/files/23048449/__nextcloud_client_buildinfo.txt)

[__nextcloud_client_parameters.txt](https://github.com/user-attachments/files/23048452/__nextcloud_client_parameters.txt)

[20251022_0910_nextcloud.log.4.gz](https://github.com/user-attachments/files/23048459/20251022_0910_nextcloud.log.4.gz)