Wc_fragment_refresh not working (solved)

They move the global enqueue support for fragments refresh

so call wp_enqueue_script( 'wc-cart-fragments' ); in your theme 

or 

Call the WC_AJAX::get_refreshed_fragments() at the end of your PHP coode responder; if it comes from an AJAX call

var fragments = response.fragments; if ( fragments ) { 
jQuery.each(fragments, function(key, value) { 
jQuery(key).replaceWith(value); 
}); 
}