WordPress admin edit-post screen: filter both custom posts and regular posts by category

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I have added a filter on pre_get_posts to merge a custom post type with the regular posts in the edit-post screen.
All posts are listed but when I try to filter these posts by category, I got an

“invalid post type” error.

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Indeed, the post_type parameter in the query string is set to “(...)&post_type=Array(...)"

Is this possible using some other hook or filter? 

// show custom posts in the admin posts list
function Myplugin_posts_add_custom( $query ) {

  $screen = get_current_screen();

  if ( is_admin() && $screen->base == 'edit' && $screen->id == 'edit-post' && $screen->post_type == 'post' ) :

    $post_types = array('post', 'my_custom_post'); 
    $query->set( 'post_type', $post_types );

    return $query;
  endif;
}
add_filter( 'pre_get_posts', 'Myplugin_posts_add_custom' );

Thanks for you help

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