[Bug]: ocTransfer12313.part not taken into account for quota

⚠️ 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

• have a bunch of .ocTransfer123123.part files, e.g 5 GB
• see that they are not shown in your quota/used disk space
• can only be verified via local disk access

Steps to reproduce

1. see above

Expected behavior

Quota/used space should be calculated correctly

Nextcloud Server version

29

Operating system

None

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

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

Start by tracing the server's quota calculation and how it handles .ocTransfer12313.part files, then reproduce the issue with a partial transfer file occupying disk space. Done means the space used by these files is included in the reported quota without counting unrelated files.