FixWooCommerceKommaShippingCOse

themes function.php ---
add_action('admin_init','load_admin_shipping_cost_bug');
function load_admin_shipping_cost_bug() {
  global $pagenow;
  if (is_admin() && $pagenow=='admin.php') {

    wp_enqueue_script('custom_js_jquery_ui',get_stylesheet_directory_uri() . '/shipping_cost_bug.js',array('jquery'));
  }
}

shipping_cost_bug.js ---
let observer = new MutationObserver(mutationRecords => {
   mutationRecords.forEach((mutation) => {
	 mutation.addedNodes.forEach((node) => {
		if (mutation.type === "childList" && node.id === "wc-backbone-modal-dialog") {
		  jQuery(document).ready(function($) {
			$('#wc-backbone-modal-dialog').find('.wc-backbone-modal-shipping-method-settings').find('.wc-backbone-modal-action-active').on('click',function(e) {
					$('.wc-backbone-modal-shipping-method-settings').find('.wc-shipping-modal-price').each(function(e){
						let value = $(this).prop('value')
						$(this).after("<span class=replace>"+
						value.toString() + ' replace ok? = ' + value.replace('.',',').toString() + '|'
						+"</span>"
						)
					})
					if (confirm(
						'Kosten für Versandklasse: Bitte das Komma prüfen! Das Tool kann helfen den automatisch fixen!'
					)) {
						$('.wc-backbone-modal-shipping-method-settings').find('.wc-shipping-modal-price').each(
							function(e){
								let value = $(this).prop('value')
								$(this).prop('value',value.replace('.',','))
								console.log($(this).val())
							}
						)
					}
					return confirm('Wenn alles passts OK; falls nicht abbrechen!')
				}
			 );

			})
		};
     });
   });
});
const targetNode = document.getElementById('wpbody');
observer.observe(document.documentElement, {
  childList: true, // observe direct children
  subtree: true, // and lower descendants too
  characterDataOldValue: true // pass old data to callback
});