[Bug]: AWS-S3 > moving data between shares of different accounts > data corruption

[mrAceT]

⚠️ 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

I have an uptodate nextcloud setup (30.0.4) running AWS S3 as main data storage.

Moving a file in my Windows shared folder results in data corruption!

Steps to reproduce

1. Set up a maiden Nextcloud setup with AWS-S3 as main storage
2. Create two users
3. Create a shared folder in User 'B' for user 'A'
4. use the windows desktop app to create a cloud drive, using user 'A'
5. place a file somewhere (NOT in the share)
6. move the file to the shared folder

Mayhem!

There is a a 'urn:oid:...' for the new user, but the file is of zero size.
In the web interface I do see the image preview of the file.
[update]But downloading is impossible[/update]

So I am expecting a "owner transfer" is attempted, but failed somehow. In the AWS-S3 structure that would be ideal, using the same urn:oid would be the nicest way to do this.. but something is clearly going wrong!

This bug makes moving files in AWS-S3 from and to shares extremely dangerous!

Expected behavior

just move the file!

Which files are affected by this bug

files being moved from and to a shared folder

Operating system

Windows

Which version of the operating system you are running.

Windows 10

Package

Official Linux AppImage

Nextcloud Server version

30.0.4 (also in 29, and I'm quite sure this happened to me in 28 also)

Nextcloud Desktop Client version

3.15.2

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

Additional info

No response

[mrAceT]

I tried restarting the desktop app in Windows, no luck
I tried updating from 29 to 30, no luck

Luckily I still had a backup of the corrupted files and removed the files (only possible in the web interface), emptied the trash and added the files again to the folder in windows, from a local (non nextcloud) folder. Did a sync again and everything was working again.