UpdateCustomerCookiesObserver.php

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<?php
namespace Magento\Persistent\Observer;

use Magento\Framework\Event\ObserverInterface;

class UpdateCustomerCookiesObserver implements ObserverInterface
{
    protected $_persistentSession;

    protected $customerRepository;

    public function __construct(
        \Magento\Persistent\Helper\Session $persistentSession,
        \Magento\Customer\Api\CustomerRepositoryInterface $customerRepository
    ) {
        $this->_persistentSession = $persistentSession;
        $this->customerRepository = $customerRepository;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        if (!$this->_persistentSession->isPersistent()) {
            return;
        }

        $customerCookies = $observer->getEvent()->getCustomerCookies();
        if ($customerCookies instanceof \Magento\Framework\DataObject) {
            $persistentCustomer = $this->customerRepository->getById(
                $this->_persistentSession->getSession()->getCustomerId()
            );
            $customerCookies->setCustomerId($persistentCustomer->getId());
            $customerCookies->setCustomerGroupId($persistentCustomer->getGroupId());
        }
    }
}