Integrate Black Studio TinyMCE in custom plugin

Hello Marco and Francesco,
I developed a custom plugin for one website and it has a text area which I would like it to have a Rich Text Editor.

I started with wp_editor, but then found out that it didn’t work with Widgets due to being dragable items.

Then I found this post in your support mentioning that it is posible, however there wasn’t more info with specifics.
https://ww.wp.xz.cn/support/topic/tinymce-in-my-widgets

I have tried with the following code:

public function form($instance)
{
...
<p><label for="<?php echo $this->get_field_id('description'); ?>"><?php _e('Content', 'pre_sized_widget'); ?>:</label>
<?php
            do_action( 'black_studio_tinymce_before_editor' );
			do_action( 'black_studio_tinymce_editor', $instance['description'], $this->get_field_id('description'), $this->get_field_name('description'), $instance['type'] );
			do_action( 'black_studio_tinymce_after_editor' );
			?>
</p>
...
}

And the editor appears, and works well, like I can add the links, tables, etc. However when I save nothing is saved and the visual editor dissapears and breaks.

Would you be able to let me know what have I done wrong. My guess is that I have to add something else but in your form function you don’t have anything else.

Kind regards
David

https://ww.wp.xz.cn/plugins/black-studio-tinymce-widget/