Tested on WPiOS with 1.4: wordpress-mobile/WordPress-iOS#11628

1. Add a list
2. Notice there's an extra line at the bottom
3. If you tap on it you can write

The resulting HTML:

<!-- wp:list -->
<ul><li>One</li><li>Two</li></ul><p>what</p></ul>
<!-- /wp:list -->

cc @SergioEstevao