code: public function handle(PreDuplicateModelEvent $event)
      {
          $model = $event->getModel();
  
          $metaModel = $this->factory->getMetaModel($model->getProviderName());
  
          if (!$metaModel || !$metaModel->hasVariants()) {
              return;
          }
  
          // If we have a varbase, reset the vargroup because we got a new id.
          if ($model->getProperty('varbase') == 1) {
              $model->setProperty('vargroup', null);
          }
      }
docs: Handle the paste into and after event.
  
  @param PreDuplicateModelEvent $event The event.
  
  @return void