Confluence tasks are not imported

The following sample contains tasks that are not imported.

<p />
<p>This a nice page with some tasks</p>
<p /><ac:task-list>
<ac:task>
<ac:task-id>2</ac:task-id>
<ac:task-status>incomplete</ac:task-status>
<ac:task-body><span class="placeholder-inline-tasks">Task 1 for <ac:link><ri:user ri:userkey="8a7f808975231346017531757d5b0311" /></ac:link><time datetime="2021-04-15" /></span></ac:task-body>
</ac:task>
<ac:task>
<ac:task-id>3</ac:task-id>
<ac:task-status>incomplete</ac:task-status>
<ac:task-body><span class="placeholder-inline-tasks">Task 2 for <ac:link><ri:user ri:userkey="8a7f80897523097801753176bb361e3a" /></ac:link><time datetime="2021-04-14" /></span></ac:task-body>
</ac:task>
<ac:task>
<ac:task-id>5</ac:task-id>
<ac:task-status>complete</ac:task-status>
<ac:task-body><span class="placeholder-inline-tasks">Task2b for <ac:link><ri:user ri:userkey="8a7f80897523097801753176bb361e3a" /></ac:link><time datetime="2021-04-19" /></span></ac:task-body>
</ac:task>
<ac:task>
<ac:task-id>4</ac:task-id>
<ac:task-status>incomplete</ac:task-status>
<ac:task-body><span class="placeholder-inline-tasks">Task 3 for <ac:link><ri:user ri:userkey="8a7f808975231346017531757d5b0311" /></ac:link> you should finish this task by <time datetime="2021-04-16" /></span></ac:task-body>
</ac:task>
</ac:task-list>
<p />
<p />