A overwritten file with inside "share_folder" doesnt returns checksum

Steps to reproduce

1. Set "shares_folder" to Shares

occ config:system:set --value 'Shares' --type string share_folder

2. as admin create file lorem.txt and share with another user test123
3. as test123 overwrite the received share with checksum

curl -XPUT http://localhost/core/remote.php/dav/files/test123/Shares/lorem.txt -d 'hello world new' -H 'OC-Checksum: SHA1:17b6b669b2361937cc739e2203243447cfd4678b'  -u test123:test123 -v

4. as test123 try to get the checksum of the updated file

curl -XPROPFIND http://localhost/core/remote.php/dav/files/test123/Shares/lorem.txt -d '<?xml version="1.0"?><d:propfind  xmlns:d="DAV:" xmlns:oc="http://owncloud.org/ns"><d:prop><oc:checksums /></d:prop></d:propfind>' -u test123:test123 -kv | xmllint --format -

Expected behaviour

The valid checksum should be returned

Actual behaviour

Checksum property is returned empty in webdav response

<?xml version="1.0"?>
<d:multistatus xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:oc="http://owncloud.org/ns">
  <d:response>
    <d:href>/core/remote.php/dav/files/test123/Shares/lorem.txt</d:href>
    <d:propstat>
      <d:prop>
        <oc:checksums/>
      </d:prop>
      <d:status>HTTP/1.1 404 Not Found</d:status>
    </d:propstat>
  </d:response>
</d:multistatus> 

Server configuration

Operating system: ubuntu 20.04

Web server: apache 2

Database: mysql Ver 8.0.25-0ubuntu0.20.04.1 for Linux on x86_64 ((Ubuntu))

PHP version: 7.4

ownCloud version: (see ownCloud admin page) git master

Updated from an older ownCloud or fresh install:

Where did you install ownCloud from: git

Reproduce the overwrite and PROPFIND requests shown in the issue against the WebDAV endpoint, then trace how checksum properties are handled for files in the configured Shares folder. Done means the PROPFIND response returns the valid checksum instead of an empty property with HTTP 404.