[Bug]: No synchronization without client restart

[MaximeMaW]

⚠️ Before submitting, please verify the following: ⚠️

• This is a bug, not a question or a configuration issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server and Desktop Client are up to date. See Server Maintenance and Release Schedule and Desktop Releases for supported versions.
• I agree to follow Nextcloud's Code of Conduct

Bug description

We are getting multiple reports of the Nextcloud client getting stuck, meaning:

• no file is being downloaded or uploaded
• (the desktop tray icon says everything is okay ✅ , but changes to 🔄 when one clicks on it)
• the download bar is stuck to 0%, even after 30 min
• restarting the client sometimes help to start dowloading

See for instance:

As a consequence, we have "out of sync" clients: (see the folder "offre suite nego" is missing in the local folders)

In the attached logs, it took 90 minutes, and multiple restarts of the app to be able to see the folder.

Here is my understanding of the attached logs:

• around 8:05 -> client requests (PROPFIND) information about the "offre suite nego" folder, including content (such requests are made every ~10')

• around 8:05 -> server responds successfully

• at that time, the folder view on the windows explorer does not update

• around 9:33, the placeholders seem to be created

It's hard to us to understand what each line of the log file means, is there a place where is it documented?

extract_log_client.log
extract_log_server.log

Steps to reproduce

1. Open the client
2. Someone else upload a folder
3. Wait... (>60 min). The folder does not appear
4. Restart the client -> the folder appear

Note that this happens often but not systematically.

Expected behavior

Sync when the folder is created, not 90 minutes later.

Which files are affected by this bug

3253-CD35_FormationAR/Offre suite nego

Operating system

Windows

Which version of the operating system you are running.

Windows 10

Package

Official Windows MSI

Nextcloud Server version

28.0.10

Nextcloud Desktop Client version

3.13.4

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

No response

Additional info

S3 backend

[AntiiHeld]

Same Issue on Windows.