XMLResponseParser.readDocument makes dangerous assumptions / fails when indent=true and [child] doc transformer

protected SolrDocument readDocument( XMLStreamReader parser ) throws XMLStreamException
{
  if( XMLStreamConstants.START_ELEMENT != parser.getEventType() ) {
    throw new RuntimeException( "must be start element, not: "+parser.getEventType() );
  }

  // ...

  while( true ) 
  {
    switch (parser.next()) {
    case XMLStreamConstants.START_ELEMENT:
      depth++;
      builder.setLength( 0 ); // reset the text
      type = KnownType.get( parser.getLocalName() );

      // ...
      
      // NOTE: nothing in this loop modifies 'type' 
      // so the 'while' is totally inappropriate even if there was no bug
      while( type == KnownType.DOC) {
        doc.addChildDocument(readDocument(parser));
        int event = parser.next();                                // PROBLEMATIC
        if (event == XMLStreamConstants.END_ELEMENT) { //Doc ends
          return doc;
        }
      }
      
      // ...