Internal 2-way sync does not pick up files / folders created/modified/deleted outside nextcloud app

### ⚠️ Before posting ⚠️

- [x] This is a **bug**, not a question or an enhancement.
- [x] I've [searched for similar issues](https://github.com/nextcloud/android/issues) and didn't find a duplicate.
- [x] I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
- [x] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/).

### Steps to reproduce

1. Enable 2-way synchronization for a folder
2. Create a file/folder using the Android file browser, modify an existing file/folder, or delete a file/folder using the Android file browser
3. Wait for the next synchronization to begin
4. The Nextcloud Android App fails to detect the files, or in other words, it does not recognize the changes

### Expected behaviour

It should be possible to create, modify, or delete a file or folder outside the Nextcloud app (e.g., using the phone's file browser or any other app with access to the synced folder).

### Actual behaviour

When creating, modifying, or deleting a file or folder outside the Nextcloud app, the app does not recognize the changes and fails to detect the new files. Despite this issue, the sync operates normally every 15 minutes.

### Android version

14

### Device brand and model

Samsung Tab S7 FE

### Stock or custom OS?

Stock

### Nextcloud android app version

3.30.1 RC1

### Nextcloud server version

29.0.6

### Using a reverse proxy?

Yes

### Android logs

_No response_

### Server error logs

_No response_

### Additional information

I have already described the issue in detail in PR #13294 .