Cannot open PDF shared with another user if download disabled

[elzody]

Describe the bug
When sharing a PDF to another user with the "Allow download and sync" option unchecked, the other person cannot view the file. It simply shows a blank screen using the files app PDF viewer (files_pdfviewer)

To Reproduce
Steps to reproduce the behavior:

1. Create or upload any PDF document
2. Share it with another user on the instance
3. Uncheck the "Allow download and sync" option in the share settings
4. Try to open the file on the other account

Expected behavior
It should display the PDF using Nextcloud Office instead of the files PDF viewer, and ideally no error should occur.

Example

Video

internal-share-disable-download-error.webm

[elzody]

Quick update for this: I don't think it's only a richdocuments issue. I tried it with other file types as well, and it always happens with the following message:

<?xml version="1.0" encoding="utf-8"?>
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:o="http://owncloud.org/ns">
  <s:exception>OCA\DAV\Connector\Sabre\Exception\Forbidden</s:exception>
  <s:message>Access to this shared resource has been denied because its download permission is disabled.</s:message>
  <o:retry xmlns:o="o:">false</o:retry>
  <o:reason xmlns:o="o:">Access to this shared resource has been denied because its download permission is disabled.</o:reason>
</d:error>

And a status code of 403 Forbidden.