[Bug]: Unknown error and network error 99 when syncing .vscode extensions

[mr-manuel]

⚠️ Before submitting, please verify the following: ⚠️

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

Bug description

When I try to sync the .vscode extension folder with the Nextcloud Client 3.6.4 (previous versions had the same problems) I get the messages unknown error and network error: 99. Then the Nextcloud Client is freezing and then crashing.

Steps to reproduce

1. Install VS Code on Windows
2. Install some extensions
3. Try to sync the folder under C:\Users%username%.vscode

Expected behavior

The sync should not fail.

Which files are affected by this bug

nearly all files

Operating system

Windows

Which version of the operating system you are running.

Windows 11 21H2

Package

Appimage

Nextcloud Server version

25.0.3

Nextcloud Desktop Client version

3.6.4

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

The logs are in the `debug.zip`, else I get this error when submitting this issue `There was an error creating your issue: body is too long (maximum is 65536 characters). `

Additional info

I'm using this Docker Compose file: docker-compose.yml.txt

Here the client logs: debug.zip

Nextcloud is behind a Haproxy, but I tried also with a direct connection to the Docker container. Same result.

Here some screenshots: