Program: 88420
Project: 88420
Buggy source:
public static Classifier instance2BST(final InstanceSpecification instance,final InstanceSpecification lastInstance,final Element owner,final Map<InstanceSpecification,Classifier> traveled){
  if (traveled.containsKey(instance)) {
    return traveled.get(instance);
  }
  final Classifier classifier=instance.getClassifier().get(0);
  final Classifier specific=(Classifier)CopyPasting.copyPasteElement(classifier,instance.getOwner(),true);
  for (  final Generalization generalization : specific.getGeneralization()) {
    generalization.dispose();
  }
  for (  final NamedElement ne : specific.getOwnedMember()) {
    ne.dispose();
  }
  for (  final Classifier c : instance.getClassifier()) {
    SpecializeClassifierAction.specialize(specific,c);
  }
  if (owner != null && owner.canAdd(specific)) {
    specific.setOwner(owner);
  }
  traveled.put(instance,specific);
  specific.setName(lastInstance != null && instance.getName().startsWith(lastInstance.getName() + "String_Node_Str") ? instance.getName().replaceFirst(lastInstance.getName() + "String_Node_Str","String_Node_Str") : instance.getName());
  specific.setName(specific.getName().substring(0,1).toUpperCase() + specific.getName().substring(1,specific.getName().length()));
  for (  final Slot slot : instance.getSlot()) {
    if (slot.getDefiningFeature() instanceof Property) {
      final Property property=(Property)slot.getDefiningFeature();
      final Property redefinedAttribute=(Property)SetOrCreateRedefinableElementAction.redefineRedefinableElement(specific,property,false,true);
      if (!slot.hasValue()) {
        continue;
      }
      if (slot.getValue().size() == 1) {
        final ValueSpecification value=slot.getValue().get(0);
        processAttribute(redefinedAttribute,value,instance,specific,traveled);
      }
 else {
        for (        final ValueSpecification value : slot.getValue()) {
          final Property subsettingProperty=Application.getInstance().getProject().getElementsFactory().createPropertyInstance();
          subsettingProperty.setOwner(specific);
          processAttribute(subsettingProperty,value,instance,specific,traveled);
          if (subsettingProperty.getType() != null && subsettingProperty.getType() instanceof Classifier) {
            final String name=subsettingProperty.getType().getName();
            subsettingProperty.setName((name.substring(0,1).toLowerCase() + name.substring(1,name.length())).replaceAll("String_Node_Str","String_Node_Str"));
          }
          subsettingProperty.getSubsettedProperty().add(redefinedAttribute);
        }
      }
    }
  }
  return specific;
}

Fixed version (ground truth):
public static Classifier instance2BST(final InstanceSpecification instance,final InstanceSpecification lastInstance,final Element owner,final Map<InstanceSpecification,Classifier> traveled){
  if (traveled.containsKey(instance)) {
    return traveled.get(instance);
  }
  final Classifier classifier=instance.getClassifier().get(0);
  final Classifier specific=(Classifier)CopyPasting.copyPasteElement(classifier,instance.getOwner(),true);
  for (  final Generalization generalization : specific.getGeneralization()) {
    generalization.dispose();
  }
  for (  final NamedElement ne : specific.getOwnedMember()) {
    ne.dispose();
  }
  for (  final Classifier c : instance.getClassifier()) {
    SpecializeClassifierAction.specialize(specific,c);
  }
  if (owner != null && owner.canAdd(specific)) {
    specific.setOwner(owner);
  }
  traveled.put(instance,specific);
  specific.setName(lastInstance != null && instance.getName().startsWith(lastInstance.getName() + "String_Node_Str") ? instance.getName().replaceFirst(lastInstance.getName() + "String_Node_Str","String_Node_Str") : instance.getName());
  specific.setName(specific.getName().substring(0,1).toUpperCase() + specific.getName().substring(1,specific.getName().length()));
  for (  final Slot slot : instance.getSlot()) {
    if (slot.getDefiningFeature() instanceof Property) {
      final Property property=(Property)slot.getDefiningFeature();
      final Property redefinedAttribute=(Property)SetOrCreateRedefinableElementAction.redefineRedefinableElement(specific,property,true,false);
      if (!slot.hasValue()) {
        continue;
      }
      if (slot.getValue().size() == 1) {
        final ValueSpecification value=slot.getValue().get(0);
        processAttribute(redefinedAttribute,value,instance,specific,traveled);
      }
 else {
        for (        final ValueSpecification value : slot.getValue()) {
          final Property subsettingProperty=Application.getInstance().getProject().getElementsFactory().createPropertyInstance();
          subsettingProperty.setOwner(specific);
          processAttribute(subsettingProperty,value,instance,specific,traveled);
          if (subsettingProperty.getType() != null && subsettingProperty.getType() instanceof Classifier) {
            final String name=subsettingProperty.getType().getName();
            subsettingProperty.setName((name.substring(0,1).toLowerCase() + name.substring(1,name.length())).replaceAll("String_Node_Str","String_Node_Str"));
          }
          subsettingProperty.getSubsettedProperty().add(redefinedAttribute);
        }
      }
    }
  }
  return specific;
}