Error in shortcode syntax for contact-form-7

Hi,
I want to make plugin with new shortcode for contact-form-7(Version 4.3) like :

if (!class_exists('nsnSourceSelection')) {    // nsn-source-selection
    class nsnSourceSelection {
        public function __construct()
        {
            DEFINE('nsnSourceSelection', true); // Pluging is inited
            add_action('plugins_loaded', array($this, 'init'), 120);
        } // function nsnSourceSelection() // constructor of plugin class

        public function init() {
            if(function_exists('wpcf7_add_shortcode')){
                wpcf7_add_shortcode('nsnsourceselection', array($this, 'nsnsourceselection_shortcode_handler'), true);
                wpcf7_add_shortcode('nsnsourceselection*', array($this, 'nsnsourceselection_shortcode_handler'), true);

            }
            add_filter('wpcf7_validate_nsnsourceselection', array($this, 'nsnsourceselection_validation'), 10, 2);
            add_filter('wpcf7_validate_nsnsourceselection*', array($this, 'nsnsourceselection_validation'), 10, 2);
            add_filter( 'wpcf7_validate_favourite-song*', 'custom_favourite_song_validation_filter', 20, 2 );
            if ( is_admin() ) { // That is admin page
                add_action('admin_init', array($this, 'add_tag_source_selection_generator'), 25);

…

In contact Editor form I have button registered and clicking it form is opened in which I genarate my selection input with dynamic data. It has next synttax :

[nsnsourceselection * favourite-song-category id:id-favourite-song-category  type_of_selection:dropdown source_function:nsn_get_artists_songs_categories sort:post_title  option_value_field:ID option_label_field:name select_label:"Favourite Song's Category"  class:" favouritesongcategory"  "XZcvZ"]

Problems are :
1) As function nsnsourceselection_validation defined as validation handler in this function I get $tag parameter with empty elaments name, options.
I think the reason on these parameters empty is invalid format of my syntax above. Is it so?
Could yoy clarify what is wrong in syntax?

also I read syntax doc from here http://contactform7.com/tag-syntax/#mail_tag, could you please give reference to syntax rules here?
As example I use dynamic-select-extension: https://github.com/Hube2/contact-form-7-dynamic-select-extension

2) Changing some parameters in my tag syntax very often I do not see my selection input in resulting page at all.
Ex: If in syntax above to remove 2 options at end, like:

[nsnsourceselection * favourite-song-category id:id-favourite-song-category  type_of_selection:dropdown source_function:nsn_get_artists_songs_categories sort:post_title  option_value_field:ID option_label_field:name  "XZcvZ"]

I saw only text of this tag in page , but not control input…

What wrong in my syntax?

Thanks!

https://ww.wp.xz.cn/plugins/contact-form-7/