Conversion fails when initial content document does not include namespace declaration

<?xml version="1.0" encoding="UTF-8" ?>
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<node>
    <!--
      You can find out more documentation on this topic
      by following these links:
        -  http://sling.apache.org/site/content-loading.html
        -  http://jackrabbit.apache.org/node-type-notation.html
     -->
    <primaryNodeType>nt:unstructured</primaryNodeType>

    <property>
        <name>title</name>
        <type>String</type>
        <value>My first node</value>
    </property>

    <property>
        <name>description</name>
        <type>String</type>
        <value>This node has been created by a sling bundle.</value>
    </property>
    
    <node>
        <name>cq:EditConfig</name>
        <primaryNodeType>cq:EditConfig</primaryNodeType>

        <property>
            <name>description</name>
            <type>String</type>
            <value>Some dummy data from sling initial content.</value>
        </property>
        
        <node>
            <name>cq:listeners</name>
            <primaryNodeType>cq:EditListenersConfig</primaryNodeType>

            <property>
                <name>description</name>
                <type>String</type>
                <value>Some dummy data from sling initial content.</value>
            </property>
            
        </node>
    </node>
    
    <node>
        
        <name>graniteComponent</name>
        <mixinNodeType>granite:Component</mixinNodeType>
        <primaryNodeType>sling:Folder</primaryNodeType>

        <node>
            <name>granite:data</name>
            <primaryNodeType>nt:unstructured</primaryNodeType>

            <property>
                <name>description</name>
                <type>String</type>
                <value>Some dummy data from sling initial content.</value>
            </property>
        </node>

        <node>
            <name>my:subnode</name>
            <primaryNodeType>nt:unstructured</primaryNodeType>

            <property>
                <name>description</name>
                <type>String</type>
                <value>Some dummy data from sling initial content.</value>
            </property>
        </node>
        
    </node>
   

</node>