HtmlAttributes array bug

Core\Ui\Html\Element\Attributes\HtmlElementAttributes Object
(
    [storage:ArrayIterator:private] => Array
        (
            [name] => tags
            [value] => Array
                (
                    [0] => gezondheid
                )

            [type] => hidden
        )

)
array(1) {
  [0]=>
  string(10) "gezondheid"
}