Internal two way syncing a folder does not properly handle file creation and deletion inside that folder

[andreas-hartmann]

⚠️ Before posting ⚠️

• This is a bug, not a question or an enhancement.
• I've searched for similar issues and didn't find a duplicate.
• I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
• I agree to follow Nextcloud's Code of Conduct.

Steps to reproduce

1. Select a folder with a few files inside the Nextcloud app and enable sync for it.
2. Wait for initial sync.
3. Modify a file in another app.
4. Wait for next sync, change will be uploaded.
5. Modify a file in the web interface.
6. Wait for next sync, change will be downloaded.
7. Add a new file in the web interface.
8. Wait for next sync, new file will be downloaded.
9. Add a new file in the synced folder on Android.
10. Wait for next sync, new file will NOT be uploaded.
11. Delete a file in the web interface.
12. Wait for next sync, file will not be deleted on Android.
13. Delete a file on Android.
14. Wait for next sync, file will not be deleted on the server.

Expected behaviour

File creation and deletion should be handled properly on both ends of the synchronization.

Actual behaviour

File creation and deletion do not always work as expected.

Android version

15

Device brand and model

Google Pixel 8

Stock or custom OS?

Custom (explain in "additional information")

Nextcloud android app version

3.30.8

Nextcloud server version

30.0.5

Using a reverse proxy?

Yes

Android logs

No response

Server error logs

Additional information

No response