Program: 88412
Project: 88412
Buggy source:
@Override public void run(){
  try {
    CountDownLatch doneSignal=new CountDownLatch(events.size());
    new Thread(() -> {
      try {
        doneSignal.await();
      }
 catch (      InterruptedException ignored) {
      }
      SyncStatusConfigurator.getSyncStatusAction().update();
    }
,"String_Node_Str").start();
    for (    PropertyChangeEvent event : events) {
      EXECUTOR_SERVICE.execute(() -> {
        Object source=event.getSource();
        if (!(source instanceof Element) || ProjectUtilities.isElementInAttachedProject((Element)source)) {
          doneSignal.countDown();
          return;
        }
        Element sourceElement=(Element)source;
        String changedPropertyName=event.getPropertyName();
        if (changedPropertyName == null || changedPropertyName.startsWith("String_Node_Str") || IGNORED_PROPERTY_CHANGE_EVENT_NAMES.contains(changedPropertyName)) {
          doneSignal.countDown();
          return;
        }
        if ((event.getNewValue() == null && event.getOldValue() == null) || (event.getNewValue() != null && event.getNewValue().equals(event.getOldValue()))) {
          doneSignal.countDown();
          return;
        }
        if (!changedPropertyName.equals(UML2MetamodelConstants.INSTANCE_DELETED)) {
          Element root=sourceElement;
          while (root.getOwner() != null) {
            root=root.getOwner();
          }
          if (!root.equals(project.getPrimaryModel())) {
            doneSignal.countDown();
            return;
          }
        }
        Comment comment;
        if (changedPropertyName.equals(PropertyNames.BODY) && sourceElement instanceof Comment && (comment=(Comment)sourceElement).getAnnotatedElement().size() == 1 && comment.getAnnotatedElement().iterator().next() == comment.getOwner()) {
          sourceElement=sourceElement.getOwner();
        }
 else         if (changedPropertyName.equals(PropertyNames.VALUE) && sourceElement instanceof ValueSpecification || changedPropertyName.equals(PropertyNames.BODY) && sourceElement instanceof OpaqueExpression || changedPropertyName.equals(PropertyNames.OPERAND) && sourceElement instanceof Expression) {
          do {
            sourceElement=sourceElement.getOwner();
          }
 while (sourceElement instanceof ValueSpecification);
        }
        if (Converters.getElementToJsonConverter().apply(sourceElement,project) == null) {
          doneSignal.countDown();
          return;
        }
        String sysmlId=Converters.getElementToIdConverter().apply(sourceElement);
        if (sysmlId == null) {
          doneSignal.countDown();
          return;
        }
        Changelog.ChangeType changeType=Changelog.ChangeType.UPDATED;
switch (changedPropertyName) {
case UML2MetamodelConstants.INSTANCE_DELETED:
          changeType=Changelog.ChangeType.DELETED;
        break;
case UML2MetamodelConstants.INSTANCE_CREATED:
      changeType=Changelog.ChangeType.CREATED;
    break;
}
inMemoryLocalChangelog.addChange(sysmlId,sourceElement,changeType);
doneSignal.countDown();
}
);
}
}
 catch (Exception e) {
Application.getInstance().getGUILog().log("String_Node_Str" + e.getMessage());
e.printStackTrace();
throw e;
}
}

Fixed version (ground truth):
@Override public void run(){
  try {
    CountDownLatch doneSignal=new CountDownLatch(events.size());
    new Thread(() -> {
      try {
        doneSignal.await();
      }
 catch (      InterruptedException ignored) {
      }
      SyncStatusConfigurator.getSyncStatusAction().update();
    }
,"String_Node_Str").start();
    HashMap<String,String> spoofedIdMapping=new HashMap<>();
    for (    PropertyChangeEvent event : events) {
      EXECUTOR_SERVICE.execute(() -> {
        Object source=event.getSource();
        if (!(source instanceof Element) || ProjectUtilities.isElementInAttachedProject((Element)source)) {
          doneSignal.countDown();
          return;
        }
        Element sourceElement=(Element)source;
        String changedPropertyName=event.getPropertyName();
        if (changedPropertyName == null || changedPropertyName.startsWith("String_Node_Str") || IGNORED_PROPERTY_CHANGE_EVENT_NAMES.contains(changedPropertyName)) {
          doneSignal.countDown();
          return;
        }
        if ((event.getNewValue() == null && event.getOldValue() == null) || (event.getNewValue() != null && event.getNewValue().equals(event.getOldValue()))) {
          doneSignal.countDown();
          return;
        }
        if (sourceElement instanceof InstanceSpecification) {
          if (changedPropertyName.equals(UMLPackage.Literals.INSTANCE_SPECIFICATION__STEREOTYPED_ELEMENT.getName()) && event.getNewValue() == null && event.getOldValue() instanceof Element) {
            Element origin=(Element)event.getOldValue();
            String spoofedId=Converters.getElementToIdConverter().apply(origin) + MDKConstants.APPLIED_STEREOTYPE_INSTANCE_ID_SUFFIX;
            if (!spoofedId.equals(sourceElement.getLocalID())) {
              spoofedIdMapping.put(sourceElement.getLocalID(),spoofedId);
            }
          }
        }
 else         if (sourceElement instanceof Slot) {
          if (changedPropertyName.equals(UMLPackage.Literals.SLOT__OWNING_INSTANCE.getName()) && event.getNewValue() == null && event.getOldValue() instanceof Element) {
            if (!spoofedIdMapping.containsKey(sourceElement.getLocalID()) && sourceElement.getLocalID().equals(Converters.getElementToIdConverter().apply(sourceElement))) {
              spoofedIdMapping.put(sourceElement.getLocalID(),MDKConstants.SLOT_ID_SEPARATOR);
            }
            if (spoofedIdMapping.containsKey(sourceElement.getLocalID())) {
              String spoofedId=spoofedIdMapping.get(sourceElement.getLocalID());
              Element owningInstance=(Element)event.getOldValue();
              if (spoofedId.startsWith(MDKConstants.SLOT_ID_SEPARATOR)) {
                String owningInstanceId=spoofedIdMapping.containsKey(owningInstance.getLocalID()) ? spoofedIdMapping.get(owningInstance.getLocalID()) : Converters.getElementToIdConverter().apply(owningInstance);
                spoofedId=owningInstanceId + spoofedId;
                spoofedIdMapping.put(sourceElement.getLocalID(),spoofedId);
              }
 else               if (!spoofedId.startsWith(Converters.getElementToIdConverter().apply(owningInstance))) {
                System.out.println("String_Node_Str");
              }
            }
          }
 else           if (changedPropertyName.equals(UMLPackage.Literals.SLOT__DEFINING_FEATURE.getName()) && event.getNewValue() == null && event.getOldValue() instanceof Element) {
            if (!spoofedIdMapping.containsKey(sourceElement.getLocalID()) && sourceElement.getLocalID().equals(Converters.getElementToIdConverter().apply(sourceElement))) {
              spoofedIdMapping.put(sourceElement.getLocalID(),MDKConstants.SLOT_VALUE_ID_SEPARATOR);
            }
            if (spoofedIdMapping.containsKey(sourceElement.getLocalID())) {
              String spoofedId=spoofedIdMapping.get(sourceElement.getLocalID());
              Element definingFeature=(Element)event.getOldValue();
              if (spoofedId.endsWith(MDKConstants.SLOT_ID_SEPARATOR)) {
                spoofedId=spoofedId + Converters.getElementToIdConverter().apply(definingFeature);
                spoofedIdMapping.put(sourceElement.getLocalID(),spoofedId);
              }
 else               if (!spoofedId.endsWith(Converters.getElementToIdConverter().apply(definingFeature))) {
                System.out.println("String_Node_Str");
              }
            }
          }
        }
        if (changedPropertyName.equals(PropertyNames.OWNED_COMMENT) && event.getNewValue() == null && event.getOldValue() != null && event.getOldValue() instanceof Element) {
          spoofedIdMapping.put(((Element)event.getOldValue()).getLocalID(),"String_Node_Str");
        }
        if (changedPropertyName.equals(PropertyNames.OWNING_PACKAGE) && event.getNewValue() == null && event.getOldValue() != null && event.getOldValue() instanceof Element) {
          if (((Element)event.getOldValue()).getLocalID().endsWith(MDKConstants.SYNC_SYSML_ID_SUFFIX)) {
            spoofedIdMapping.put(sourceElement.getLocalID(),"String_Node_Str");
          }
        }
        if (!changedPropertyName.equals(UML2MetamodelConstants.INSTANCE_DELETED)) {
          Element root=sourceElement;
          while (root.getOwner() != null) {
            root=root.getOwner();
          }
          if (!root.equals(project.getPrimaryModel())) {
            doneSignal.countDown();
            return;
          }
        }
        Comment comment;
        if (changedPropertyName.equals(PropertyNames.BODY) && sourceElement instanceof Comment && (comment=(Comment)sourceElement).getAnnotatedElement().size() == 1 && comment.getAnnotatedElement().iterator().next() == comment.getOwner()) {
          sourceElement=sourceElement.getOwner();
        }
 else         if (changedPropertyName.equals(PropertyNames.VALUE) && sourceElement instanceof ValueSpecification || changedPropertyName.equals(PropertyNames.BODY) && sourceElement instanceof OpaqueExpression || changedPropertyName.equals(PropertyNames.OPERAND) && sourceElement instanceof Expression) {
          do {
            sourceElement=sourceElement.getOwner();
          }
 while (sourceElement instanceof ValueSpecification);
        }
        if (Converters.getElementToJsonConverter().apply(sourceElement,project) == null) {
          doneSignal.countDown();
          return;
        }
        String sysmlId=Converters.getElementToIdConverter().apply(sourceElement);
        if (sysmlId == null) {
          doneSignal.countDown();
          return;
        }
        if (spoofedIdMapping.containsKey(sysmlId)) {
          String spoofedId=spoofedIdMapping.get(sysmlId);
          if (!(sourceElement instanceof Slot) || !(spoofedId.startsWith(MDKConstants.SLOT_VALUE_ID_SEPARATOR) || spoofedId.endsWith(MDKConstants.SLOT_VALUE_ID_SEPARATOR))) {
            sysmlId=spoofedId;
          }
          if (sysmlId.isEmpty()) {
            doneSignal.countDown();
            return;
          }
        }
        Changelog.ChangeType changeType=Changelog.ChangeType.UPDATED;
switch (changedPropertyName) {
case UML2MetamodelConstants.INSTANCE_DELETED:
          changeType=Changelog.ChangeType.DELETED;
        break;
case UML2MetamodelConstants.INSTANCE_CREATED:
      changeType=Changelog.ChangeType.CREATED;
    break;
}
inMemoryLocalChangelog.addChange(sysmlId,sourceElement,changeType);
doneSignal.countDown();
}
);
}
}
 catch (Exception e) {
Application.getInstance().getGUILog().log("String_Node_Str" + e.getMessage());
e.printStackTrace();
throw e;
}
}