[Bug]: Nextcloud sync new folders into wrong locations, sometimes

[omocinteractive]

⚠️ This issue respects the following points: ⚠️

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

Bug description

It happend 2 times in the last 2 years on different client/server/os versions - nextcloud sync some new folder into wrong location. In the first case, 350gb of privat photos 2 years ago (PC - nc server). In the last case, 1,5tb of business client data (Mac OS server to nc server - here some very important contract data appeared in a public working directory). There are more cases in the nextcloud Facebook community!

Steps to reproduce

Sync a larger collection of data with many folder (different client/server/os versions)

Expected behavior

Sync all files and folders into the correct location

Installation method

None

Nextcloud Server version

26

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

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

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

No response

[joshtrichards]

I'm going to take a wild guess you're referring to the standard Desktop client and transfer this over to their repository.

Unfortunately though it's going to be challenging to work on this without reproduction steps or, at the very least, the configuration of the client and server. Ideally logs from the client or, at the very least, the server during one of these events.

[omocinteractive]

Yes, it is the standard client and standard configuration. Unfortunately, the problem with the directories was only discovered days and weeks later without the log files being backed up. As I said - there were other cases of people telling about it in the Facebook community. Maybe these people will also report about it here.