view and context variables does not get passed on VBO custom execute action

I have created a custom VBO action and below is my code for the customaction.php. The action is getting created perfectly fine, however the $view and $context variables are not getting passed through. They are all getting null. Below is the custom action code:

    namespace Drupal\mymod\Plugin\Action;
    
    use Drupal\views_bulk_operations\Action\ViewsBulkOperationsActionBase;
    
    /**
     * create custom action
     *
     * @Action(
     *   id = "custom_action",
     *   label = @Translation("custom action"),
     *   type = "",
     *   confirm = TRUE,
     *   pass_context = TRUE,
     *   pass_view = TRUE,
     *   requirements = {
     *     "_custom_access" = TRUE,
     *   },
     * )
     */
    
    class customaction extends ViewsBulkOperationsActionBase {
    
      use StringTranslationTrait;
    
      /**
       * {@inheritdoc}
       */
    
      public function execute(ContentEntityInterface $entity = NULL) {
    dpm($this);
//custom action code....
    }
      /**
       * {@inheritdoc}
       */
      public function access($object, AccountInterface $account = NULL, $return_as_object = FALSE) .....

doing a dpm($this) inside the execute method returns the below output:

I am using VBO 4.0 version. Any help on identifying the mistake?