[Bug]: Can't upload sparsebundle image

[changhoon-sung]

⚠️ 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

Can't upload .sparsebundle disk image

Steps to reproduce

1. Create sparse bundle disk image from MacOS (let's say a.dmg.sparsebundle)
2. Copy the image to VFS mounted nextcloud directory
3. Unexpected behavior happens.
   • it seems like that the upload is failed, backup created, fail again, backup created, try n times..)
   • broken imgs created like a.dmg.sparsebundle, a 2.dmg.sparsebundle, a 3.dmg.sparsebundle, not uploaded properly.
   • normal img created like a 4.dmg.sparsebundle, but not uploaded properly

Expected behavior

The metadata for the sparsebundle and the actual data bundle consisting of the bands must both be uploaded as appropriate.
I've checked Google Drive handles it correctly.

Which files are affected by this bug

a.dmg.sparsebundle

Operating system

macOS

Which version of the operating system you are running.

macOS Sequoia 15.7.2

Package

Official macOS Virtual files 12+ universal pkg

Nextcloud Server version

32.0.0

Nextcloud Desktop Client version

4.0.1

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

Additional info

Desktop Client Log debug.zip