cleaner version fixed in core.

Author: SebSept

js/common.js

@@ -1904,7 +1904,7 @@ function setupAdaptDropdown(config)
     }
     const select2_el = $('#' + field_id).select2(options);
 
-    select2_el.bind('setValue', (e, value) => {
+    select2_el.bind('setValue', (e, ...value) => {
         $('#' + field_id).val(value).trigger('change');
     });
     $('label[for=' + field_id + ']').on('click', function () {

templates/components/itilobject/timeline/form_validation.html.twig

@@ -361,12 +361,7 @@
                         waitForElement("#dropdown_items_id_target{{ rand }}").then((elm) => {
                            // set items_id_target
                            $("#dropdown_items_id_target{{ rand }}").ready(function() {
-                               if (Array.isArray(data.items_id_target)) {
-                                   $("#dropdown_items_id_target{{ rand }}").val(data.items_id_target);
-                                   $("#dropdown_items_id_target{{ rand }}").trigger('change');
-                               } else {
-                                   $("#dropdown_items_id_target{{ rand }}").trigger('setValue', data.items_id_target);
-                               }
+                               $("#dropdown_items_id_target{{ rand }}").trigger('setValue', data.items_id_target);
                            });
                         });
                      });