[Bug]: MacOS VFS file sync stuck in loop

[kintaro1981]

⚠️ 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

Desktop client stuck in an upload loop syncing the files over and over again.
After the file is uploaded it starts again and again and...
It's the same behaviour from here:
https://help.nextcloud.com/t/large-file-upload-with-macos-client-not-working/208619

Steps to reproduce

1. use VFS sync
2. add a large file (>1GB maybe even >750MB) in a finder's synced directory
3. wait for the upload

Expected behavior

the file get uploaded

Which files are affected by this bug

file large more then 1GB or maybe a little less

Operating system

macOS

Which version of the operating system you are running.

MacOS 15.2 (24C101)

Package

Other

Nextcloud Server version

29.0.9

Nextcloud Desktop Client version

3.15.3

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

I'm on a hetzner "storage share" istance but it happens also selfhosting (see bug description)

Additional info

anonimized log:
2025-02-13_archivio_debug_nextcloud.zip

[Kaliumhexacyanoferrat]

I can second this. Since a couple of weeks the MacBook of my wife starts synchronizing files over and over again. Can add two details:

1. For me it only happens on folders shared by another user (so I shared a folder to my wife, she moved it as a subfolder into a synchronized folder and this shared folder is synchronized over and over again)
2. After upgrading to the latest client version (with the hope that the bug goes away), the client started to create additional, empty folders with the name of the shared one on the server (so instead of just "SharedFolder" there are now also "SharedFolder (2)" and "SharedFolder (2) (2)")

I re-created the folder sync connection which did not help. Currently working around this by ignoring the folder in concern when synchronizing files.

MacOS Version is 12.7.6. Server version is 30.0.0.6.

Schematic:

- Synced Folder
---- A
---- B <- Shared by another user
---- B (2)
---- B (2) (2)
---- C 

Took me a while to notice so the client synchronized 1.5 TB in the meantime :)