[Bug]: Windows Application don't sync all files

### ⚠️ 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

In our organization we have our own server running Nextcloud 23.0.5 in an Ubuntu 20.04 Server with MariaDB. All the users use the Windows Client to keep synced all our files.
Today I find that one user don't see any file in a shared folder, but if the user login in the web application and navigate to this folder he can see all the files. Also, when the user create a new folder in the windows explorer, the Nextcloud (3.5.1) client start to sync all the files inside this folder.
I force the sync in the client, but nothing happend.

### Steps to reproduce

1. I found a folder without any files in the windows explorer.
2. Check that this folder have files in the web browser.
3. Force the sync in the desktop client (nothing happend).
4. Create a folder/file in this empty folder.
5. Windows client start to sync all files inside this folder.

### Expected behavior

I expect that the user see the same files in the windows explorer and the web browser.

### Which files are affected by this bug

\Compartida\Proyectos\Lyrtron\Nexum\Desarollo\Mediciones\Mediciones con NRFConnect\Prueba Interna de Prototipos\FF\2021-06-11

### Operating system

Windows

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

Windows 10

### Package

Other

### Nextcloud Server version

23.0.5

### Nextcloud Desktop Client version

3.5.1

### 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
- [X] LDAP/ Active Directory
- [ ] SSO - SAML
- [ ] Other

### Nextcloud Server logs

_No response_

### Additional info

_No response_

Start by reproducing the missing-file behavior at the reported Windows path, comparing the web folder with Windows Explorer and forcing a client sync. Use the listed Nextcloud Server 23.0.5, Desktop Client 3.5.1, Windows 10, LDAP/Active Directory, and disabled encryption details to narrow the cause. Done means all existing files appear in Explorer and continue syncing normally.

Written by the indexing model from the issue text.