SvgImageWidget::validateRequiredFields() produces an error message if an image field is hidden with hook_entity_field_access()

To reproduce:

• 1. Install Drupal with the standard profile, so there's an article node type with an image field
• 2. Add this implementation of hook_entity_field_access() to a custom module:

/**
 * Implements hook_entity_field_access().
 */
function MYMODULE_entity_field_access($operation, \Drupal\Core\Field\FieldDefinitionInterface $field_definition, \Drupal\Core\Session\AccountInterface $account, \Drupal\Core\Field\FieldItemListInterface $items = NULL) {
  if ($field_definition->getName() == 'field_image' && $operation == 'edit') {
    return \Drupal\Core\Access\AccessResult::forbidden();
  }
}

• 3. Create a new article node

The image field is hidden in the article form, as expected. However, on saving, there is this error message:

Warning: array_key_exists() expects parameter 2 to be array, null given in Drupal\svg_image\Plugin\Field\FieldWidget\SvgImageWidget::validateRequiredFields() (line 324 of core/modules/contrib/svgimage/src/Plugin/Field/FieldWidget/SvgImageWidget.php).