[Bug]: Icon of a windows folder being reset at every sync

### ⚠️ 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

folder icons are reset at syncronisation with nc server, done by nc desktop on win11

### Steps to reproduce

On Windows,
1. click on a folders options and give it an icon of the .ico format
2. the folder now looks like the ion picture you defined
3. step into this folder and move a file into
4. step out of this folder and wait for NC sync
5. the icon you gave the folder is reset to standard.
6. repeat this until you push your mouse out of windows
7. ...

### Expected behavior

Folder Icon must not been reset
...

### Which files are affected by this bug

every folder in the sync dir

### Operating system

Windows

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

win 11

### Package

Official Linux AppImage - Ubuntu 25.04

### Nextcloud Server version

32.0.2

### Nextcloud Desktop Client version

4.0.3

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

Updated from a minor version (ex. 3.16.1 to 3.16.2)

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

Encryption is Enabled

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

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

### Nextcloud Server logs

```shell

```

### Additional info

To clearify here are 2 screens before.png and after nc desktop syncs