Program: 185083
Project: 185083
Buggy source:
private void handleRun(R existingRun,ContentAccessor newAttachPoint){
  for (  Object o2 : existingRun.getContent()) {
    if (isCharType(o2,STFldCharType.BEGIN)) {
      seenSeparate=false;
      depth++;
      if (depth == 1) {
        newR=Context.getWmlObjectFactory().createR();
        newR.getContent().add(o2);
        currentField=new FieldRef();
        fieldRefs.add(currentField);
        currentField.setParent(newAttachPoint);
        currentField.setBeginRun(newR);
      }
    }
 else     if (isCharType(o2,STFldCharType.END)) {
      if (!seenSeparate) {
        R separateR=Context.getWmlObjectFactory().createR();
        FldChar fldChar=Context.getWmlObjectFactory().createFldChar();
        fldChar.setFldCharType(STFldCharType.SEPARATE);
        newR.getContent().add(fldChar);
        newAttachPoint.getContent().add(separateR);
        newR=Context.getWmlObjectFactory().createR();
        currentField.setResultsSlot(newR);
      }
      depth--;
      if (depth == 0) {
        newAttachPoint.getContent().add(newR);
        newR=Context.getWmlObjectFactory().createR();
        newR.getContent().add(o2);
        newAttachPoint.getContent().add(newR);
        currentField.setEndRun(newR);
        newR=Context.getWmlObjectFactory().createR();
      }
 else {
        newR.getContent().add(o2);
      }
    }
 else     if (isCharType(o2,STFldCharType.SEPARATE)) {
      seenSeparate=true;
      newR.getContent().add(o2);
      if (depth == 1) {
        newAttachPoint.getContent().add(newR);
        newR=Context.getWmlObjectFactory().createR();
        newR.setRPr(fieldRPr);
        currentField.setResultsSlot(newR);
      }
    }
 else     if (o2 instanceof JAXBElement && ((JAXBElement)o2).getName().equals(_RInstrText_QNAME)) {
      currentField.setInstrText((JAXBElement<Text>)o2);
      newR.getContent().add(o2);
      fieldRPr=existingRun.getRPr();
      newR.setRPr(fieldRPr);
    }
 else     if (depth == 1 && seenSeparate) {
      System.out.println("String_Node_Str" + XmlUtils.marshaltoString(o2,true,true));
    }
 else {
      newR.getContent().add(o2);
      newR.setRPr(existingRun.getRPr());
      newAttachPoint.getContent().add(newR);
      newR=Context.getWmlObjectFactory().createR();
    }
  }
}

Fixed version (ground truth):
private void handleRun(R existingRun,ContentAccessor newAttachPoint){
  log.debug("String_Node_Str" + XmlUtils.marshaltoString(existingRun,true,true));
  for (  Object o2 : existingRun.getContent()) {
    if (isCharType(o2,STFldCharType.BEGIN)) {
      seenSeparate=false;
      depth++;
      System.out.println("String_Node_Str" + depth);
      if (depth == 1) {
        newR=Context.getWmlObjectFactory().createR();
        newR.setRPr(existingRun.getRPr());
        newR.getContent().add(o2);
        currentField=new FieldRef();
        fieldRefs.add(currentField);
        currentField.setParent(newAttachPoint);
        currentField.setBeginRun(newR);
      }
    }
 else     if (isCharType(o2,STFldCharType.SEPARATE)) {
      seenSeparate=true;
      newR.getContent().add(o2);
      if (depth == 1) {
        newAttachPoint.getContent().add(newR);
        log.debug("String_Node_Str" + XmlUtils.marshaltoString(newR,true,true));
        newR.setRPr(existingRun.getRPr());
        newR=Context.getWmlObjectFactory().createR();
        newR.setRPr(existingRun.getRPr());
        currentField.setResultsSlot(newR);
      }
    }
 else     if (isCharType(o2,STFldCharType.END)) {
      log.debug("String_Node_Str");
      if (!seenSeparate) {
        log.debug("String_Node_Str");
        FldChar fldChar=Context.getWmlObjectFactory().createFldChar();
        fldChar.setFldCharType(STFldCharType.SEPARATE);
        newR.getContent().add(fldChar);
        newAttachPoint.getContent().add(newR);
        log.debug("String_Node_Str" + XmlUtils.marshaltoString(newR,true,true));
        newR=Context.getWmlObjectFactory().createR();
        newR.setRPr(existingRun.getRPr());
        currentField.setResultsSlot(newR);
      }
      depth--;
      if (depth == 0) {
        newAttachPoint.getContent().add(newR);
        newR.getContent().add(o2);
        log.debug("String_Node_Str" + XmlUtils.marshaltoString(newR,true,true));
        currentField.setEndRun(newR);
        newR=Context.getWmlObjectFactory().createR();
        newR.setRPr(existingRun.getRPr());
      }
 else {
        newR.getContent().add(o2);
      }
    }
 else     if (o2 instanceof JAXBElement && ((JAXBElement)o2).getName().equals(_RInstrText_QNAME)) {
      currentField.setInstrText((JAXBElement<Text>)o2);
      newR.getContent().add(o2);
    }
 else     if (depth == 1 && seenSeparate) {
      System.out.println("String_Node_Str" + XmlUtils.marshaltoString(o2,true,true));
    }
 else {
      newR.getContent().add(o2);
      newAttachPoint.getContent().add(newR);
      log.debug("String_Node_Str" + XmlUtils.marshaltoString(newR,true,true));
      newR=Context.getWmlObjectFactory().createR();
      newR.setRPr(existingRun.getRPr());
    }
  }
}