Yith Booking calendar conflict ui-icons_444444_256x240.png

Hello,
Using Yith booking, suddenly after last enfold update calendar arrows disappeared.
https://myjapanguide.com/booking/sumo-morning-training

ui-icons_444444_256x240.png is an icon image used in jQuery UI themes. So I placed it the plugin directory and use CSS

#top ui-datepicker-header ui-widget-header ui-helper-clearfix ui-corner-all .ui-icon,
.ui-widget-content .ui-icon {
background-image: url(“/wp-content/plugins/yith-woocommerce-booking-premium/assets/css/images/ui-icons_444444_256x240.png”);
}
But it doesn’t work. But when logged as admin, the arrows show.

Is there a way to pull this png from Enfold or where is it in enfold? I couldn’t find it in Jquery

Thank you