I accept your answer. What I have provided in my OP was just a sample and my XML is big and I manipulated the XML before converting it to a HashRef.

for $TmpNode ($dom->findnodes('//Emphasis')) {
    $tStr = $TmpNode->toString(1);
    $new_node = $dom->createTextNode( "$tStr" );
    $TmpNode->replaceNode($new_node);
}
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