[Bug]: federated Shares do not sync (always?)

### ⚠️ 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

federated Shares do not sync (always?) and Desktop client reports problems of closed stream.

### Steps to reproduce

1. create a federated share
2. enable nextcloud desktop sync
3. enable syncing for the federated share
...

### Expected behavior

changes in the federated share should be synced to the source federation instance.

workaround - unselect the federated share for syncing (and use directory from the source instance if possible)
...

### Which files are affected by this bug

files in Shares

### Operating system

macOS

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

Sequoia 15.2

### Package

Official Linux AppImage

### Nextcloud Server version

29.0.9

### Nextcloud Desktop Client version

3.14

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

### Nextcloud Server logs

```shell

```

### Additional info

_No response_