CustomerLogout.php

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<?php
namespace Magento\Wishlist\Observer;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\Customer\Model\Session;

class CustomerLogout implements ObserverInterface
{
    protected $customerSession;

    public function __construct(Session $customerSession)
    {
        $this->customerSession = $customerSession;
    }

    public function execute(Observer $observer)
    {
        $this->customerSession->setWishlistItemCount(0);
    }
}