crstnio

Works at my end. Notice the full path.

<!-- wp:list -->
<ul>
    <li>List 1</li>
    <li>List 2<img src="http://example.com/wp-content/uploads/2018/01/img.png" /></li>
</ul>
<!-- /wp:list -->

But this forum is not for issues. Please open the issue on GitHub.