When copying a folder, the copy and its subfolders sizes are set to 0kb

⚠️ 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

When copying a folder in Nextcloud (my version is 29.0.1), the generated folder and its subfolders get a size of 0kb

Steps to reproduce

1. Select whichever folder you want
2. Copy it in your Nextcloud root folder
3. See the size set to 0kb

Expected behavior

Its size should be calculated depending on the contained files & subfolders

Installation method

Community Docker image

Nextcloud Server version

29

Operating system

Debian/Ubuntu

PHP engine version

None

Web server

None

Database engine version

None

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

Start by reproducing the folder-copy steps described for Nextcloud Server 29.0.1, then trace the server-side copy workflow and the calculation of folder and subfolder sizes. Done means copied folders report sizes based on their contained files and subfolders rather than 0 KB.