The CatalogProvider getProductData method is not called. Why?

Question

1C-Bitrix

The rule for working in the basket is not suitable, because data is changeable (item ID).
It is necessary that when adding a product to a position there was a discount, depending on certain conditions.
How to implement the discount functionality correctly?

I tried using CATALOG_PROVIDER_CLASS, but this method does not work.
I provide the code below:

namespace My;

use \Bitrix\Main\Diag\Debug;
class MyCatalogProvider extends \Bitrix\Catalog\Product\CatalogProvider
{
    public function getProductData(array $arParams)
    {
        self::log($arParams, 'logs/_catalogpriceprovider.log');
    }

    public static function log($var, $path = 'logs/dump.log', $varName='')
    {
        Debug::dumpToFile($var, $varName, $path);
    }
}

Add position:

// .... 
$arFields = [
            'PRODUCT_ID' => (int)$id,
            'QUANTITY' => (int)$quantity,
//            'PRICE' => $arPriceOptimal['RESULT_PRICE']['BASE_PRICE'] - $arPriceOptimal['RESULT_PRICE']['DISCOUNT_PRICE'],
//            'CURRENCY' => $arPriceOptimal['RESULT_PRICE']['CURRENCY'],
            'CATALOG_PROVIDER_CLASS' => '\\My\\MyCatalogProvider'
        ];

$rs = \Bitrix\Catalog\Product\Basket::addProductToBasket(self::getBasketForCurrentFUser(), $arFields, ['SITE_ID' => 's3']);

But the getProductData method of the class is not called...