<html>
    <head>
      <base href="https://bugs.documentfoundation.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - FILEOPEN PPTX: strange polygon artefact"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=139425">139425</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>FILEOPEN PPTX: strange polygon artefact
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>LibreOffice
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>7.2.0.0.alpha0+ Master
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>UNCONFIRMED
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Impress
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>libreoffice-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>gerald@pfeifer.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=168698" name="attach_168698" title="Simple PPTX slide">attachment 168698</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=168698&action=edit" title="Simple PPTX slide">[details]</a></span>
Simple PPTX slide

Opening the attached document, there a strange red polygon appears in 
LibreOffice, that does not show in Office 365 (nor PowerPoint from what
I've been told).

Version: 7.2.0.0.alpha0+
Build ID: 1f1f68d6e8a32d8884e8de322e32c588a87964db
CPU threads: 8; OS: Linux 5.9; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
TinderBox: Linux-rpm_deb-x86_64@86-TDF, Branch:master, Time:
2021-01-03_02:57:44
Calc: threaded

Already in 6.4, too, so presumably not a (recent) regression:

Version: 6.4.8.0.0+
Build ID: 99b065ec31d032fc08ab14f66430dac4fef904a5
CPU threads: 8; OS: Linux 5.9; UI render: default; VCL: gtk3; 
TinderBox: Linux-rpm_deb-x86_64@86-TDF, Branch:libreoffice-6-4, Time:
2020-10-08_08:57:08
Locale: en-US (en_US.UTF-8); UI-Language: en-US
Calc: threaded</pre>
        </div>
      </p>


      <hr>
      <span>You are receiving this mail because:</span>

      <ul>
          <li>You are the assignee for the bug.</li>
      </ul>
    </body>
</html>