[Bug]: Multiple file upload unable to complete if destination folder has duplicate files

[gdragon-git]

⚠️ 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

Let's say I'm uploading 6 files, 3 of them are already in the folder, the other 3 should normally be uploaded then.
But if I "Skip" the other 3, or select I'd like to keep the ones already existing in the folder, the 3 that are missing won't be uploaded. On the top right I get the message "Conflicts resolution skipped"

This is an apparent regression in 31.x that wasn't in 27.x

Steps to reproduce

1. Try to upload a set of files that has multiple duplicates already in source folder using web drag and drop
2. Select skip OR select keep the ones in the existing folder
3. Note that the non-duplicates won't be transferred
4. Note "Conflicts resolution skipped" in top right

Expected behavior

It would be expected that when "keep the ones in existing folder" is selected, the rest of the batch from the drag and drop upload attempt would still transfer to the server

Nextcloud Server version

31

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.4

Web server

Apache (supported)

Database engine version

MySQL

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

Fresh Nextcloud Server install

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

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

Configuration report

unable

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

[susnux]

Duplicate of #50740