Sticky Navigation 8.x-1.1. Funny padding-top
So far my solution was to apply CSS + jQuery to me theme:

CSS

body.js--padding-fix {
   padding-top:0 !important;
}


and JQUERY

jQuery(document).ready(function () {
    if (jQuery('div.primary-menu-container-global').hasClass('stickynav-active')) 
    {
        jQuery('body').addClass('js--padding-fix'); 
    }     
});


Note: if you apply the CSS directly to the body tag, it creates a problem with the Admin Menu, that covers the top of the site (minimized this way)

Is there a better solution?