Error with multi-level XML documents

[prochst]

Hi,
I am using this library for parsing XML feeds and I have encountered an error if the xml document contains multilevel elements. If the multilevel element is at the end of the record, everything is OK, but if it is followed by one or more simple elements in the record, then the multilevel element is dropped from the parsing result.
Example of XML data:

<T_NEW_CATALOG>
    <PRODUCT mode="new">
      <NODE_ID>98b9b3498bd0</NODE_ID>
      <PRODUCT_FEATURES>
        <FEATURE>
          <FNAME>Symbol Info</FNAME>
          <FVALUE>Angabe der Bemessungstemperatur nach IEC. Dies ist die höchste Temperatur.</FVALUE>
          <TRANSLATION_US>
            <FNAME>Symbol Info</FNAME>
            <FVALUE>The maximum operating temperature is given by a T marking according to IEC. </FVALUE>
          </TRANSLATION_US>
        </FEATURE>
        <FEATURE>
          <FNAME>Symbol Ausprägung</FNAME>
          <FVALUE>0,4 - 1,5</FVALUE>
          <TRANSLATION_US>
            <FNAME>Symbol value</FNAME>
            <FVALUE>0.4 - 1.5</FVALUE>
          </TRANSLATION_US>
        </FEATURE>
        <FEATURE>
          <FNAME>Symbol Text</FNAME>
          <FVALUE>Leuchtwanddicke mit Angabe in mm</FVALUE>
          <TRANSLATION_US>
            <FNAME>Symbol Text</FNAME>
            <FVALUE>Mounting material thickness (in mm)</FVALUE>
          </TRANSLATION_US>
        </FEATURE>
      </PRODUCT_FEATURES>
      <PRODUCT_NAME>Unit test of aplication</PRODUCT_NAME>
    </PRODUCT>
</T_NEW_CATALOG>

Parse function:

$data = $stub->parse([ 'product' => ['uses' => 'T_NEW_CATALOG.PRODUCT[NODE_ID>node_id,PRODUCT_FEATURES{FEATURE{FNAME>name,FVALUE>value,TRANSLATION_US.FNAME>feature_translation_name,TRANSLATION_US.FVALUE>feature_translation_value}>feature}>product_features,PRODUCT_NAME>product_name]'],
        ]);

and result is:
array(2) { ["node_id"]=> string(12) "98b9b3498bd0" ["product_name"]=> string(23) "Unit test of aplication" }

If the <PRODUCT_FEATURES> element was at the end, the result is correct.

The problem is in the function
protected function parseValueCollection(SimpleXMLElement $content, array $uses): array
On a multi-level element, the $value variable is not updated, and on a subsequent loop with a single element, $result is overwritten with the non-updated $value.