Elementor get_style_depends() function not working in preview mode

We are developing a WordPress Theme using Elementor. We have created widgets to easily build website pages or customize the page using Elementor Page Builder Plugin. get_script_depends() function loads the script file on elementor preview mode when only use the widget on page. but we can’t load the style file using get_style_depends() function on elementor preview mode when only use the widget.