[Qt6][Windows][Bug]: Some kind of timeout when starting to sync (file download fails)

[allexzander]

⚠️ 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

Set up a new folder connection to the server and start syncing files. More than 50% of the time, some files will fail to sync with an error displayed as a timeout of network connection. This happens with and without virtual files (you need to try to download a file with VFS in order for this to happen).

Steps to reproduce

1. Install a desktop client build built with Qt6
2. Setup a new folder connection and start syncing files
3. Observe the issue

Expected behavior

Syncing works as expected similar to how it works with Qt5 build.

Which files are affected by this bug

all

Operating system

Windows

Which version of the operating system you are running.

All Windows

Package

Other

Nextcloud Server version

all

Nextcloud Desktop Client version

3.13.50

Is this bug present after an update or on a fresh install?

Fresh desktop client install

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

No response

[allexzander]

@mgallien

[mgallien]

@tobiasKaminsky blocking bug for any release based on master branch

[mgallien]

Closed by #6987