Javascript events cart.updated params.notify undefined

if (window.Oby) {
    window.Oby.registerAjax(["cart.updated"], function (params) {
    console.log(params.notify); // undefined
}

{
   "id":36053,
   "el":{
      "uid:0":"j"
   },
   "product_id":"2266",
   "type":"cart",
   "resp":{
      "products":[
         {
            "product_id":2266,
            "cart_product_id":44412,
            "quantity":3,
            "product_name":"Product name"
         }
      ],
      "ret":36053,
      "product_id":2266,
      "cart_product_id":44412,
      "product_name":"Product name",
      "quantity":3,
      "image":"/images/img_produse/incarca/thumbnails/50x50/barcode.png"
   }
}

 [array] cart_products
- [stdClass object] 44691
--Properties
 ---[string] cart_id = "36063"
 ---[integer] cart_product_id = 44691
 ---[integer] cart_product_modified = 1665653737
 ---[integer] cart_product_option_parent_id = 0
 ---[integer] cart_product_parent_id = 0
 [---[integer] cart_product_quantity = 4
 ---[string] cart_product_ref_price = "9.00000"
 ---[integer] product_id = 2300
.
.
.
 [array] products
- [stdClass object] 44691
--Properties
 ---[array] all_prices
 ---[string] cart_product_id = "44691"
 ---[string] cart_product_option_parent_id = "0"
 ---[string] cart_product_parent_id = "0"
 ---[string] cart_product_quantity = "4"
 ---[integer] cart_product_total_quantity = 4
 ---[integer] cart_product_total_variants_quantity = 4
 ---[stdClass object] old
 ----Properties
 -----[integer] quantity = 4  // <==== Isn't this supposed to be the old quantity of the product, before the product in the basket is updated?

	public function validate(&$controller, &$params, $data = array()) {
		if(empty($data))
			$data = hikaInput::get()->get('checkout', array(), 'array');
		if(empty($data['cart']))
			return true;
		if(empty($data['cart']['item']))
			return false;

		$items = array();
		foreach($data['cart']['item'] as $k => $v) {
			if((int)$v == 0 && !is_numeric($v))
				continue;
			$items[] = array(
				'id' => (int)$k,
				'qty' => (int)$v
			);
		}
		if(empty($items))
			return true;

		$checkoutHelper = hikashopCheckoutHelper::get();
		$cart = $checkoutHelper->getCart();

		$msg_cpt = !empty($cart->messages) ? count($cart->messages) : 0;

		$cartClass = hikashop_get('class.cart');
                
                $oldProducts = hikashop_copy($cart->products);
                
		$ret = $cartClass->updateProduct($cart->cart_id, $items);

		$cart = $checkoutHelper->getCart(true);

		if(empty($cart->products)) {
			$checkoutHelper->redirectBeforeDisplay = JText::_('CART_EMPTY');
		}

		if(!$ret && !empty($cart->messages) && count($cart->messages) > $msg_cpt) {
			return false;
		}

		if(!$ret)
			return true;

                // OLD VS NEW  CART======================== START
                $oldProductsCounter = count($oldProducts);
                $ProductsCounter = count($cart->products);
                $modifiedProduct = array();
                if($oldProductsCounter == $ProductsCounter){
                    // only quantity was modifyed
                    foreach($cart->products AS $c => $c_value){
                        // get only the modified product
                        if($c_value->cart_product_quantity != $oldProducts[$c]->cart_product_quantity){
                            $modifiedProduct[$c]=$c_value;
                            $modifiedProduct[$c]->old->quantity = $oldProducts[$c]->cart_product_quantity;
                            $modifiedProduct[$c]->action='qty_update';
                        }
                    }                    
                }else if($oldProductsCounter > $ProductsCounter and $ProductsCounter > 0){
                    // a product was removed from cart
                    foreach($oldProducts AS $o => $o_value){
                        if(!isset($cart->products[$o])){
                            $modifiedProduct[$o] = $o_value;
                            $modifiedProduct[$o]->action = 'removed_product';
                        }
                    }
                }else if(empty($cart->products)){
                    // the last product was removed from cart
                    foreach($oldProducts AS $o => $o_value){
                        $modifiedProduct[$o]=$o_value;
                        $modifiedProduct[$o]->action='last_product';
                    }
                }
              // OLD VS NEW  CART======================== END

		if(!empty($params['src']['context']) && $params['src']['context'] == 'submitstep') {
			$checkoutHelper->addMessage('cart.updated', array(
				JText::_('CART_UPDATED'),
				'success'
			));
		}

		$eventParams = null;
		if(!empty($params['src']))
			$eventParams = array('src' => $params['src'],'product'=>$modifiedProduct);
		$checkoutHelper->addEvent('checkout.cart.updated', $eventParams);
		return true;
	}

_nzm.run( 'require', 'ec');
_nzm.run( 'set', 'currencyCode', 'EUR' );
_nzm.run( 'ec:addProduct', {
  'id': 'product_id',
  'name': 'product_name',
  'price': '84.00',
  'quantity': '1'
} );
_nzm.run( 'ec:setAction', 'purchase', {
  'id': '758',
  'revenue': '84.00',
  'tax': '0',
  'shipping': '4.00'
} );
_nzm.run('send', 'pageview');