Put images in populated items compatibility

If I use

// enable compatibility with theme custom menu walkers
add_filter('jcs/enable_public_walker', '__return_false');

with this plugin that make a mobile menu
Responsive menu wordpress

I can′t use this function in populated items for take thumbnails

add_filter( 'jcs/menu_item_args', 'jcs_menu_item_args', 10, 2);
function jcs_menu_item_args($args, $item){

switch($item->object){
    case 'page':
        // add blue 10 pixel image before the menu item name
        $args->link_before = '<img alt="" src="https://placehold.it/10x10/0000FF" />';
    break;
    case 'term':
        // add green 10 pixel image before the menu item name
        $args->link_before = '<img alt="" src="https://placehold.it/10x10/00FF00" />';
    break;
    case 'post':
        // add red 10 pixel image before the menu item name
        $args->link_before = '<img alt="" src="https://placehold.it/10x10/FF0000" />';
    break;
}
return $args;
}

There is another function or hack to make this??

thx for your time