[Bug]: Syncing to S3 Storage (e.g. minio server) syncs folders twice into a subtree

⚠️ 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

look below

Steps to reproduce

1.Minio S3 Storage provide a bucket
2. Syncing to bucket with NExtcloud 27 syncs folders twice into a subtree
3. means /example plus content of folder syncs to /example plus content of folder AND /example/example plus content of folder
4. you see the bug only on the S3 storage side, not within Nextcloud !
5. pydio client e.g. does not make this bug in S3 structure, so it is a bug of nextcloud

Expected behavior

syncs only once with mirroring exactly the folder structure

Installation method

Community Docker image

Nextcloud Server version

27

Operating system

Debian/Ubuntu

PHP engine version

None

Web server

Nginx

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?

Encryption is Disabled

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

Start by reproducing the issue with Nextcloud 27 and a Minio S3 bucket, then compare the bucket tree with the original folder structure. The issue provides no file or test entry point; done means each folder and its contents appear only once in the S3-side mirror.