METS: Last mets node is always skipped

When trying to import something like

METS Sample

<div ID="DIV.14" TYPE="TITLESECTION" ORDER="1">
    <div ID="DIV.15" TYPE="HEADLINE" ORDER="1">
        <fptr>
            <seq>
                <area BETYPE="IDREF" FILEID="ocr.1" BEGIN="PAG_1_TB000001"/></seq>
        </fptr>
    </div>
</div>

The DIV.15 element will be skipped. The Element referencing "PAG_1_TB000001" will be linked to the one referencing "DIV.14".

Offending lines are in METS parsing. In the end, we publish on element.parent_id and link the ALTO element to this one. We should instead get_or_create the element of DIV.15 and link the ALTO element to it.