Widget doesn't get wrapped in before and after code

If I put the shortcode in a text widget (as per instructions), the search form shows up but it is not inside the widget’s before and after code. That code is pushed down so the search form appears above it.

This behavior doesn’t happen with regular text inside the widget.

Expected output:

<ul>
   <li class="sidebox widget-name-1">
   <h3>Widget title</h3>
   Some widget
   </li>
   <li class="sidebox widget_text">
   <h3>Widget title</h3>
   AWPQSF form
   </li>
</ul>

What comes out instead:

<ul>
   <li class="sidebox widget-name-1">
   <h3>Widget title</h3>
   Some widget
   </li>
   AWPQSF form
   <li class="sidebox widget_text">
   <h3>Widget title</h3>
   </li>
</ul>

https://www.ads-software.com/extend/plugins/advance-wp-query-search-filter/