horizontal space problem with paragraphs (due to listitem plugin?)

The attached docbook file highlights a problem with the calculation of the
available space/width for paragraphs. I think it's probably an issue with
the listitem plugin rather than the paragraph one, but don't really know
where to look to check this assumption out.

If you look at the attached file in Conglomerate you'll notice that the
first paragraph (contents "This paragraph is okay.") is drawn correctly,
in that the right-hand edge of the border can be seen. The second
paragraph, which is inside the list and has contents of 'The
"bounding-box" of this item is wrong.', is drawn incorrectly since you can
not see the right-hand edge of the bounding box.  It can also be seen if
you move the mose between the contents of this paragraph, the paragraph
itself, and the listitem it is in, since the solid-black bounding box has
no right edge for the paragraph or its contents.

Hope this is clear enough a description of the problem,
Doug

<?xml version="1.0"?>
<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<article>
<section>
  <title>Foo</title>
  <para>This paragraph is okay.</para>
  <itemizedlist>
    <listitem>
    <para>The "bounding-box" of this item is wrong.</para>
    </listitem>
  </itemizedlist>
</section>
</article>