Autorename doesnot works by default when uploading file in the public link with upload only permission using the old webdav api

Steps to reproduce

1. Create a public link with upload only permission.
2. upload a file to the public link eg. test.txt
3. Using the old public webdav api try to upload another file with same name (test.txt)

curl http://owncloud/public.php/webdav/test.txt -u j5rdmu8P43xtp4o:"" -X PUT -H "Content-Type: text/plain" --data-raw 'hello world' -v

Expected behaviour

The file should be uploaded with new name (eg. test (2).txt, That is the current behavior when using the new public webdav api)

edit : Looks like the renaming is only possible when setting header OC-Autorename: 1. But since it is a default behavior in the new public webDAV API, Shouldn't it be the same in the old one.

Actual behaviour

We get http 403 and the file is not uploaded.
The user gets following response and the file is not created.

<?xml version="1.0" encoding="utf-8"?>
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns">
  <s:exception>Sabre\DAV\Exception\Forbidden</s:exception>
  <s:message/>
</d:error>

Server configuration

Operating system: ubuntu 18.04

Web server: apache

Database: mysql

PHP version: 7.2

ownCloud version: (see ownCloud admin page) ownCloud 10.3.0 (git)

Updated from an older ownCloud or fresh install: fresh

Where did you install ownCloud from: git

Start with the public.php/webdav endpoint and reproduce the duplicate upload using the provided curl command, comparing it with the new public WebDAV API behavior. Trace how the upload-only public link handles the OC-Autorename header in the old API. Done means a second test.txt upload receives an automatic new name instead of HTTP 403.