diff --git a/core/lib/Drupal/Core/Field/WidgetBase.php b/core/lib/Drupal/Core/Field/WidgetBase.php
index e97816e..075e142 100644
--- a/core/lib/Drupal/Core/Field/WidgetBase.php
+++ b/core/lib/Drupal/Core/Field/WidgetBase.php
@@ -427,7 +427,7 @@ public function massageFormValues(array $values, array $form, array &$form_state
    */
   protected function sortItems(FieldItemListInterface $items) {
     if ($this->fieldDefinition->isMultiple() && isset($items[0]->_weight)) {
-      $itemValues = $items->getValue();
+      $itemValues = $items->getValue(TRUE);
       usort($itemValues, function ($a, $b) {
         $a_weight = (is_array($a) ? $a['_weight'] : 0);
         $b_weight = (is_array($b) ? $b['_weight'] : 0);
diff --git a/core/modules/file/file.field.inc b/core/modules/file/file.field.inc
index c7ca17e..a65e08a 100644
--- a/core/modules/file/file.field.inc
+++ b/core/modules/file/file.field.inc
@@ -521,7 +521,7 @@ function file_field_find_file_reference_column(FieldInterface $field) {
  *
  * @param $variables
  *   An associative array containing:
- *   - items: An array of FileFieldItem items.
+ *   - items: field values, as a FileFieldItemList object.
  *
  * @ingroup themeable
  */