Strange behavior by dublicating elements

[CnczubehoerEu]

Hi!

I have the following HTML code:

<div id="hero_techSpec">
	<br/>
	<br/>
	<strong>Technische Daten:</strong><br/>
	<br/>
	<div class="hero_techSpecItem">
		<strong><span class="techSpec_liSign">&raquo;</span> <span class="hero_techSpecItemName"></span>:</strong> <span class="hero_techSpecItemValue"></span><br/>
	</div>
</div>

The element with class "hero_techSpecItem" I have to dublicate.

I tried the following:

$techSpec = $document->first("#hero_techSpec");
$techSpecItemTemplate = $techSpec->first(".hero_techSpecItem");                            
$techSpecItemNew = clone $techSpecItemTemplate;

/** @var Element $techSpecItemName */
$techSpecItemName = $techSpecItemNew->first(".hero_techSpecItemName");

echo $techSpecItemName->html();
$techSpecItemName->setInnerHtml($value->getSpecification()->getName());
echo $techSpecItemName->html();

/** @var Element $techSpecItemValue */
$techSpecItemValue = $techSpecItemNew->first(".hero_techSpecItemValue");
$techSpecItemValue->setInnerHtml($value->getValue());

echo $techSpecItemNew->html(); die;

$techSpec->appendChild($techSpecItemNew);

Very interesting is "echo" number 2 and 3. Number 2: Everything is inserted fine. However, in the third "echo", there is the old state again.

Do you have any ideas, why this happens as it happens?

Thank you!

Tobias