Client aborts sync in case of upload fails to an read-only shared folder

[Elleven1]

⚠️ 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

Using Windows sync client V3.14.1 synchonization ends without any error message, but no files are synchronized. Searching in the local log files it leads to the root cause. A shared folder with a missing right for the user to create new files, where the user stored a file locally. Than during sync scan the scanning process ended without uploading or downloading files to/from any other folders. After enabling the right for creating new files to that dedicated shared folder, the sync process completed successfully as expected.

The point is, that the process ends completely in such a case without synchronizing anything. My expectation would be, that just that single file cannot by synchronized due to the missing rights and that the user would get an error massege in the client window.

Virtual files are enabled

Steps to reproduce

1. Share a folder to any user
2. In the user defined rights (Benutzerdefinierte Berechtigungen in German) enable all rights except create (Erstellen in German)
3. Setting up the windows client for that user with enabled virtual files
4. Wait, until initial synchronization has completed
5. Creaty any file in that shared folder locally on the user's machine
6. Nothing get's synchonized anymore

Expected behavior

• All syncronizations should proceed as usual except that dedicated file, which was created locally
• The user getts an error message in the windows client

Nextcloud Server version

30

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

MariaDB

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

[FriedVariable]

Same here for macOS. Need a quick fix please.

[Elleven1]

I've tested this issue with 3.13.4 and 3.14.0. Issue is the same there