Edit taxonomy for custom post type loses menu item

Hi,
I’ve found an anoying thing editing custom taxonomies related to a custom post type.

When editing a custom taxonomy related to a custom post type the URL looks like this:

edit-tags.php?action=edit&taxonomy=tipo&tag_ID=1&post_type=experiencia

Once edited I’m redirected to:

edit-tags.php?taxonomy=tipo&lang=es&message=3

The param post_type disappear and the wrong submenu posts is displayed.
Any ideas?

I’m using Simple Taxonomy plugin to create the taxonomies.