diff --git a/src/Field/Configurator/CollectionConfigurator.php b/src/Field/Configurator/CollectionConfigurator.php
index bf76093133..b5c73a7ed4 100644
--- a/src/Field/Configurator/CollectionConfigurator.php
+++ b/src/Field/Configurator/CollectionConfigurator.php
@@ -97,7 +97,12 @@ private function formatCollection(FieldDto $field, AdminContext $context): int|s
                 return $this->countNumElements($field->getValue());
             }
 
-            $collectionItemsAsText[] = (string) $item;
+            $itemString = (string) $item;
+            if (!mb_check_encoding($itemString, 'UTF-8')) {
+                $itemString = mb_convert_encoding($itemString, 'UTF-8', 'UTF-8');
+            }
+
+            $collectionItemsAsText[] = $itemString;
         }
 
         $isDetailAction = Action::DETAIL === $context->getCrud()->getCurrentAction();