Some tags not returned with mysql cache enabled

[siggma]

Some tags are not being returned when MySql caching is enabled.
I don't know if it's specific to the files, it probably is. These are from a rather new release.

Version:
define('GETID3_VERSION', '1.7.8b2');

In the playlist at the links below, at the bottom of the list, most of the dido album is effected and I haven't figured it out yet.

Cached playist using idv1
http://www.trbailey.org/music/xspf.php

Cached playlist with $getID3->clear_cache(); first.
http://www.trbailey.org/music/xspf.php?reset

Note the output correctly finds the tags when caching is disabled or reset.

Sources are available at:
xspf.phps
xspf.settings.phps