Is this a bug? (serach for post_tye display also simple post)

Hi, I’ve installed the plugin and setup it with this function:

p2p_register_connection_type( array(
‘from’ => ‘books’,
‘to’ => ‘auteur’,
‘prevent_duplicates’ => false,
‘title’ => array(
‘from’ => ‘Dessinateur’,
‘to’ => ‘Auteur’
)
) );

I wish get only “auteur” item in the box to connect the post_type “book”…. but when I start to write I see only simple posts (all the artricles). If I delete the text, then I can access to the auteurs items… It seems that the search function don’t work well.

Is this a bug or I forgot something in the code?
Thnks