[Bug]: Always available locally : partial sync on subfolders

### ⚠️ 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

On a windows PC, a folder is marked as "Always available locally", but some subfolders are marked as "online only". And with a right clic on this folders, it's impossible to set it to "Always available locally".
Folder set to always available :

Subfolders with "cloud" icon, and not synced locally :



We had to uncheck "Always available locally", then check it again, to get all synced.

### Steps to reproduce

Don't know how to reproduce, and how it arrives...

### Expected behavior

All subfolders and files always available locally...

### Which files are affected by this bug

Folder Bordeaux Merisier

### Operating system

Windows

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

Windows 10

### Package

Official Windows MSI

### Nextcloud Server version

30.0.12

### Nextcloud Desktop Client version

3.16.5

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

Updated from a minor version (ex. 3.4.2 to 3.4.4)

### 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

```shell
I can give logs if you give me a secured upload link.
```

### Additional info

_No response_