Program: 69300
Project: 69300
Buggy source:
public Step execute(UserRequest ureq1,WindowControl wControl1,StepsRunContext runContext){
  boolean hasChanges=false;
  PublishProcess publishManager=(PublishProcess)runContext.get("String_Node_Str");
  PublishEvents publishEvents=publishManager.getPublishEvents();
  if (runContext.containsKey("String_Node_Str") && ((Boolean)runContext.get("String_Node_Str")).booleanValue()) {
    @SuppressWarnings("String_Node_Str") Collection<String> selectedNodeIds=(Collection<String>)runContext.get("String_Node_Str");
    hasChanges=(selectedNodeIds != null) && (selectedNodeIds.size() > 0);
    if (hasChanges) {
      publishManager.applyPublishSet(ureq1.getIdentity(),ureq1.getLocale(),false);
    }
  }
  if (runContext.containsKey("String_Node_Str")) {
    CourseAccessAndProperties accessAndProperties=(CourseAccessAndProperties)runContext.get("String_Node_Str");
    publishManager.changeAccessAndProperties(getIdentity(),accessAndProperties);
    hasChanges=true;
  }
  if (runContext.containsKey("String_Node_Str")) {
    String choice=(String)runContext.get("String_Node_Str");
    @SuppressWarnings("String_Node_Str") List<CategoryLabel> categories=(List<CategoryLabel>)runContext.get("String_Node_Str");
    publishManager.publishToCatalog(choice,categories);
  }
  if (publishEvents.getPostPublishingEvents().size() > 0) {
    for (    MultiUserEvent event : publishEvents.getPostPublishingEvents()) {
      CoordinatorManager.getInstance().getCoordinator().getEventBus().fireEventToListenersOf(event,ores);
    }
  }
  return hasChanges ? StepsMainRunController.DONE_MODIFIED : StepsMainRunController.DONE_UNCHANGED;
}

Fixed version (ground truth):
@Override public Step execute(UserRequest ureq1,WindowControl wControl1,StepsRunContext runContext){
  boolean hasChanges=false;
  PublishProcess publishManager=(PublishProcess)runContext.get("String_Node_Str");
  PublishEvents publishEvents=publishManager.getPublishEvents();
  if (runContext.containsKey("String_Node_Str") && ((Boolean)runContext.get("String_Node_Str")).booleanValue()) {
    @SuppressWarnings("String_Node_Str") Collection<String> selectedNodeIds=(Collection<String>)runContext.get("String_Node_Str");
    hasChanges=(selectedNodeIds != null) && (selectedNodeIds.size() > 0);
    if (hasChanges) {
      publishManager.applyPublishSet(ureq1.getIdentity(),ureq1.getLocale(),false);
    }
  }
  if (runContext.containsKey("String_Node_Str")) {
    CourseAccessAndProperties accessAndProperties=(CourseAccessAndProperties)runContext.get("String_Node_Str");
    publishManager.changeAccessAndProperties(getIdentity(),accessAndProperties);
    hasChanges=true;
  }
  CourseCatalog courseCatalog=(CourseCatalog)runContext.get("String_Node_Str");
  if (courseCatalog != null) {
    publishManager.publishToCatalog(courseCatalog.getChoiceValue(),courseCatalog.getCategoryLabels());
  }
  if (publishEvents.getPostPublishingEvents().size() > 0) {
    for (    MultiUserEvent event : publishEvents.getPostPublishingEvents()) {
      CoordinatorManager.getInstance().getCoordinator().getEventBus().fireEventToListenersOf(event,ores);
    }
  }
  return hasChanges ? StepsMainRunController.DONE_MODIFIED : StepsMainRunController.DONE_UNCHANGED;
}