Sync downloads all files again

[mhastu]

⚠️ Before posting ⚠️

• [X] This is a bug, not a question or an enhancement.
• [X] I've searched for similar 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.

Steps to reproduce

1. Sync an online folder to the phone by pressing the three dots and selecting "sync"
2. Add files to the online folder
3. Sync again

Expected behaviour

Only new or updated files get downloaded.

Actual behaviour

All files in the folder get downloaded again.

Android version

12

Device brand and model

FP4

Stock or custom OS?

Custom (explain in "additional information")

Nextcloud android app version

3.29.0

Nextcloud server version

9.0.2.2

Using a reverse proxy?

No

Android logs

No response

Server error logs

No response

Additional information

Before the sync, a lot of files show the green check icon in the app, after starting the sync, they all change to the syncing icon.