[Bug]: Total loss of files when restoring from recycle bin on MacBook possible

[ericfischereu]

⚠️ 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

In a special constellation it is possible to completely loose a lot of files when using the sync client at least on a MacBook, maybe the others behave the same. I accidentally put a folder into the recycle bin, then immediately paused the sync. After I restored everything, I continued the sync. This however deleted the files on the server and on my MacBook. The files aren't in the server's recycle bin neither. I have backups to restore from, but this should not happen. At least there should be a way to restore the files from the server's recycle bin.

Steps to reproduce

1. Delete a folder on the device.
2. Immediately pause the sync in the desktop client.
3. Restore the folder on the device.
4. Resume sync.

Expected behavior

The files should at least be available in the recycle bin on the server.

Which files are affected by this bug

a folder with all kinds of files

Operating system

macOS

Which version of the operating system you are running.

macOS Sequoia 15.0.1

Package

Official macOS 12+ universal pkg

Nextcloud Server version

30.0.5

Nextcloud Desktop Client version

3.15.0

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

Updated to a major version (ex. 3.3.6 to 3.4.0)

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

Additional info

No response

[claucambra]

Hi @ericfischereu could you confirm whether you were using classic sync or virtual files sync?

[ericfischereu]

@claucambra It was the classic sync.