db4-upgrade.xsl dropping <title> elements from <refsynopsisdiv>

If I convert the attached Docbook 4 file via e.g.

xsltproc /usr/share/xml/docbook/stylesheet/docbook5/db4-upgrade.xsl db4.xml > db5.xml

    the resulting Docbook 5 file drops the <title> element from the
<refsynopsisdiv> section (but not from the converted <refsect1> section).
This seems like a bug in the conversion, but I wanted to check that I
wasn't missing something before filing a bug against the Sourceforge
project. The db4-upgrade.xsl version is

# Release: $Id: db4-upgrade.xsl 7660 2008-02-06 13:48:36Z nwalsh $

    Thanks,
    Jon Leech