Wrong parameter type in the 'customer_register_success' dispatch

[WaPoNe]

System: Magento Version: Magento Open Source ver. 2.4.5/2.4.5-p3 Vanilla
PHP Version: 8.1
Gigya Version: gigya/magento2-im: 6.0.0/6.1.0

Issue description:
Installed the extension in a Vanilla instance, it works fine.
If I create my module with a frontend observer on 'customer_register_success' event (<mage_dir>/app/code/Vendor/Module/etc/frontend/events.xml):

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="customer_register_success">
        <observer name="my_customer_register_success_observer" instance="Vendor\Module\Observer\CustomerRegisterSuccess" />
    </event>
</config>

trying to get data from account controller (<mage_dir>/app/code/Vendor/Module/Observer/CustomerRegisterSuccess.php)

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $params = $observer->getAccountController()->getRequest()->getParams();
        $customerEmail = $params['email'];
    }

I get this message error:
Undefined array key "email"

This depends from your source code that overrides Magento core class by preference Gigya/GigyaIM/etc/di.xml

    <preference for="Magento\Customer\Controller\Account\LoginPost"
                type="Gigya\GigyaIM\Controller\Raas\GigyaPost" />

and in gigyaCreateUser() function of Gigya\GigyaIM\Controller\Raas\GigyaPost class

            $this->_eventManager->dispatch(
                'customer_register_success',
                ['account_controller' => $this, 'customer' => $customer]
            );

returning account_controller with Gigya\GigyaIM\Controller\Raas\GigyaPost type (and without data) instead of Magento\Customer\Controller\Account\CreatePost type as documentated by Magento (vendor/magento/module-customer/README.md):

customer_register_success event in the \Magento\Customer\Controller\Account\CreatePost::execute method. Parameters:
- account_controller is a $this object (\Magento\Customer\Controller\Account\CreatePost class)
- customer is a customer object (\Magento\Customer\Model\Data\Customer class)

'customer_register_success' event is used in many vendor extensions.

Could you solve the problem?