wp_get_archives returns extra list item after upgrade to 2.2

Just upgraded a site to 2.2 from 2.0.3, and followed the instructions to the letter. All seems well now except one small thing. The theme uses a simple call to wp_get_archives, nothing unusual:

<ul id="archives">
<?php wp_get_archives('type=monthly'); ?>
</ul>

But the output includes an extra list item at the end, linked to the current month’s archive, and the link text is ” 0″. The current month & year link is correctly displayed at the top of the list.

That last, extraneous list item looks like this:

<li><a href='http://www.example.com/2007/05/' title=' 0'> 0</a></li>

Note to Admins: I originally tried to create this thread as http://wordpress.org/support/topic/118918 but I clicked edit, made a small change, and saved, then found my topic closed.