mondrake
--- a/core/modules/image/src/Plugin/Field/FieldWidget/ImageWidget.php
+++ b/core/modules/image/src/Plugin/Field/FieldWidget/ImageWidget.php
    return $element;
  }

+  /**
+   * {@inheritdoc}
+   */
+  public function massageFormValues(array $values, array $form, FormStateInterface $form_state) {
+    // Since the file upload widget now supports uploads of more than one file
+    // at a time it always returns an array of fids. We have to translate this
+    // to a single fid, as the field expects a single value. In this process, we
+    // have to unset any image dimension for files other than the first, so that
+    // the dimensions are not copied from those of the first file.
+    $new_values = [];
+    foreach ($values as &$value) {
--- a/core/modules/image/src/Plugin/Field/FieldWidget/ImageWidget.php
+++ b/core/modules/image/src/Plugin/Field/FieldWidget/ImageWidget.php
+    $field_name = $element['#field_name'];
+    $parents = $element['#field_parents'];
+
+    $submitted_values = NestedArray::getValue($form_state->getValues(), array_slice($button['#parents'], 0, -2));
+    foreach ($submitted_values as $delta => $submitted_value) {
+      if (empty($submitted_value['fids'])) {
+        unset($submitted_values[$delta]);
+      }
+    }
+
+    // If there are more files uploaded via the same widget, we have to
+    // separate them, as we display each file in its own widget. In this
+    // process, we have to unset any image dimension for files after the first,
+    // that would otherwise be copied from those of the first file.
+    $new_values = [];
+    foreach ($submitted_values as $delta => $submitted_value) {