[Bug]: Linux Desktop Client is constantly syncing and writing to disc even no changes happened

### ⚠️ 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

Since one of the last two updates (3.14.1 or 3.14.0) the nextcloud desktop client is syncing every second. This means that the icon changes from green with white checkmark to the blue syncing sign for about half a second, changes back to green sign and again after half of a second back to the syncing sign.

In the system monitor, the nextcloud desktop app writes constantly 1.7 mb/s to disk, which is about 50 GB on a full working day. This happens all the time, even no program is open or writing to the nextcloud folder. It does not occure, when no network connection is present. So maybe it could also be a problem on the nextcloud server.

### Steps to reproduce

1. Check that a network connection to the server is possible
2. Start the nextcloud desktop app

### Expected behavior

The nextcloud desktop app should only sync, when a new file is created or a file has changed.

### Which files are affected by this bug

Don't know which files are affected

### Operating system

Linux

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

ZorinOS 17.2

### Package

Community FlatPak

### Nextcloud Server version

29.0.8

### Nextcloud Desktop Client version

3.14.1

### 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?

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

### Nextcloud Server logs

_No response_

### Additional info

While this bug is present, I have updated the nextcloud server version from 29.0.7 (i guess) to 29.0.8 but the bug still exists. I am not a 100% sure if I have updated the desktop client as well, but I think the problem started with version 3.14.0 and I have updated it to 3.14.1 without success. I think the problem started after a desktop client update and not after a server update.

I have also tried to reinstall the nextcloud desktop client and deleted the local copies of all files and resynced them without success as well.

I am not syncing local data of the nextcloud server, the data are connected by smb to the nextcloud server from a Qnap NAS. I connected it via the GUI of Nextcloud and not via fstab or something on the linux server where nextcloud is installed.