Not all post shown with plugin activated

Context :

• WP last version, PP Permissions last version
  
• – The author #2 has 3 posts : 1 published, 2 pending
  
• If logged as “Editor”, with PP Permission activated, the following code returns wrong results (1 post)
  
• if logged as “Editor”, without PP Permissions activated (inactive), the following code return correct results (3 posts)

$args = array
(
'post_status' => array('publish','pending', 'inherit'),
'post_type' => 'post',
'posts_per_page' => -1,
'author' => 2,
);
$query = new WP_Query($args);
if ($query->have_posts())
{
   echo("# : ".$query->post_count."<br>");
} else {
   echo("else....");
}

There is something I do not understand ! May be wrong config (english is not my language ….)
Help greatly appreciated
thanks