Program: 185062
Project: 185062
Buggy source:
/** 
 * Insert an empty placeholder SDT, to facilitate round-tripping (ie ability to convert instance docx back to original template), which you may wish to do if you want to insert updated data, but preserve certain manual edits.
 * @param sdt
 * @return
 */
private List<Object> conditionFalse(Object sdt){
  List<Object> newContent=new ArrayList<Object>();
  newContent.add(sdt);
  SdtPr sdtPr=getSdtPr(sdt);
  CTDataBinding binding=sdtPr.getDataBinding();
  if (binding != null) {
    sdtPr.getRPrOrAliasOrLock().remove(binding);
  }
  Tag tag=sdtPr.getTag();
  final String tagVal=tag.getVal();
  final Pattern stripConditionArgPattern=Pattern.compile("String_Node_Str");
  final Matcher stripPatternMatcher=stripConditionArgPattern.matcher(tagVal);
  if (!stripPatternMatcher.matches()) {
    log.error("String_Node_Str" + tagVal);
    return newContent;
  }
  final String emptyConditionValue=BINDING_RESULT_CONDITION_FALSE + "String_Node_Str" + stripPatternMatcher.group(2)+ stripPatternMatcher.group(3);
  tag.setVal(emptyConditionValue);
  CTLock lock=Context.getWmlObjectFactory().createCTLock();
  lock.setVal(org.docx4j.wml.STLock.SDT_CONTENT_LOCKED);
  JAXBElement<org.docx4j.wml.CTLock> lockWrapped=Context.getWmlObjectFactory().createSdtPrLock(lock);
  sdtPr.getRPrOrAliasOrLock().add(lockWrapped);
  TcFinder tcFinder=new TcFinder();
  new TraversalUtil(((SdtElement)sdt).getSdtContent().getContent(),tcFinder);
  if (tcFinder.tcList.size() > 0) {
    Tc tc=tcFinder.tcList.get(0);
    tc.getContent().clear();
    P p=Context.getWmlObjectFactory().createP();
    tc.getContent().add(p);
    ((SdtElement)sdt).getSdtContent().getContent().clear();
    ((SdtElement)sdt).getSdtContent().getContent().add(tc);
  }
 else {
    ((SdtElement)sdt).getSdtContent().getContent().clear();
  }
  return newContent;
}

Fixed version (ground truth):
/** 
 * Insert an empty placeholder SDT, to facilitate round-tripping (ie ability to convert instance docx back to original template), which you may wish to do if you want to insert updated data, but preserve certain manual edits.
 * @param sdt
 * @return
 */
private List<Object> conditionFalse(Object sdt){
  List<Object> newContent=new ArrayList<Object>();
  newContent.add(sdt);
  SdtPr sdtPr=getSdtPr(sdt);
  CTDataBinding binding=sdtPr.getDataBinding();
  if (binding != null) {
    sdtPr.getRPrOrAliasOrLock().remove(binding);
  }
  Tag tag=sdtPr.getTag();
  final String tagVal=tag.getVal();
  final Pattern stripConditionArgPattern=Pattern.compile("String_Node_Str");
  final Matcher stripPatternMatcher=stripConditionArgPattern.matcher(tagVal);
  if (!stripPatternMatcher.matches()) {
    log.error("String_Node_Str" + tagVal);
    return newContent;
  }
  final String emptyConditionValue=BINDING_RESULT_CONDITION_FALSE + "String_Node_Str" + stripPatternMatcher.group(2)+ stripPatternMatcher.group(3);
  tag.setVal(emptyConditionValue);
  CTLock lock=Context.getWmlObjectFactory().createCTLock();
  lock.setVal(org.docx4j.wml.STLock.SDT_CONTENT_LOCKED);
  JAXBElement<org.docx4j.wml.CTLock> lockWrapped=Context.getWmlObjectFactory().createSdtPrLock(lock);
  sdtPr.getRPrOrAliasOrLock().add(lockWrapped);
  TableObjectFinder tableObjectFinder=new TableObjectFinder();
  new TraversalUtil(((SdtElement)sdt).getSdtContent().getContent(),tableObjectFinder);
  if (tableObjectFinder.result == null) {
    ((SdtElement)sdt).getSdtContent().getContent().clear();
  }
 else   if (tableObjectFinder.result instanceof Tbl) {
    ((SdtElement)sdt).getSdtContent().getContent().clear();
  }
 else   if (tableObjectFinder.result instanceof Tr) {
    ((SdtElement)sdt).getSdtContent().getContent().clear();
  }
 else   if (tableObjectFinder.result instanceof Tc) {
    Tc tc=(Tc)tableObjectFinder.result;
    tc.getContent().clear();
    P p=Context.getWmlObjectFactory().createP();
    tc.getContent().add(p);
    ((SdtElement)sdt).getSdtContent().getContent().clear();
    ((SdtElement)sdt).getSdtContent().getContent().add(tc);
  }
 else {
  }
  return newContent;
}