diff --git a/src/Form/Extension/ChoiceTypeExtension.php b/src/Form/Extension/ChoiceTypeExtension.php
index 836a12e005..8bf6439ba5 100644
--- a/src/Form/Extension/ChoiceTypeExtension.php
+++ b/src/Form/Extension/ChoiceTypeExtension.php
@@ -15,6 +15,9 @@
 
 use Symfony\Component\Form\AbstractTypeExtension;
 use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Form\FormEvent;
+use Symfony\Component\Form\FormEvents;
 use Symfony\Component\Form\FormInterface;
 use Symfony\Component\Form\FormTypeInterface;
 use Symfony\Component\Form\FormView;
@@ -27,6 +30,25 @@
  */
 final class ChoiceTypeExtension extends AbstractTypeExtension
 {
+    public function buildForm(FormBuilderInterface $builder, array $options): void
+    {
+        if ($options['multiple'] && (true === ($options['sortable'] ?? false))) {
+            $builder->addEventListener(FormEvents::PRE_SUBMIT, static function (FormEvent $event) use ($options) {
+                /** @var PreSubmitEvent $event */
+                $form = $event->getForm();
+                $data = $event->getData();
+
+                if (!is_array($data) || count($data) !== 1) {
+                    return;
+                }
+
+                if (str_contains($data[0], ',')) {
+                    $event->setData(explode(',', $data[0]));
+                }
+            }, 1);
+        }
+    }
+    
     public function configureOptions(OptionsResolver $resolver): void
     {
         $optionalOptions = ['sortable'];
diff --git a/src/Resources/views/CRUD/Association/edit_many_script.html.twig b/src/Resources/views/CRUD/Association/edit_many_script.html.twig
index a23ab8070b..7825c44da0 100644
--- a/src/Resources/views/CRUD/Association/edit_many_script.html.twig
+++ b/src/Resources/views/CRUD/Association/edit_many_script.html.twig
@@ -329,17 +329,24 @@ This code manages the many-to-[one|many] association field popup
                             data: {_xml_http_request: true },
                             dataType: 'html',
                             type: 'POST',
-                            success: function(html) {
+                            success: function(html) { 
                                 jQuery('#field_container_{{ id }}').replaceWith(html);
                                 var newElement = jQuery('#{{ id }} [value="' + data.objectId + '"]');
-                                if (newElement.is("input")) {
-                                    newElement.attr('checked', 'checked');
+
+                                if (newElement.length) {
+                                    if (newElement.is("input")) {
+                                        newElement.attr('checked', 'checked');
+                                    } else {
+                                        newElement.attr('selected', 'selected');
+                                    }
                                 } else {
-                                    newElement.attr('selected', 'selected');
+                                    var selections = jQuery('#{{ id }}').val().split(',');
+                                    selections.push(data.objectId);
+                                    jQuery('#{{ id }}').val(selections.filter((val) => val.length > 0).join(','));
                                 }
 
                                 jQuery('#field_container_{{ id }}').trigger('sonata-admin-append-form-element');
-                            }
+                            } 
                         });
 
                     {% endif %}