In other way you can  get wishlist items collection.

Use  factory **`Magento\Wishlist\Model\ResourceModel\Item\CollectionFactory`** for getting *wishlist product collection*  and filter  that by `addCustomerIdFilter($customerId)`


    protected $_currentUserWishlistCollectionFactory ;
    protected $_Customersession;
    public function __construct(
           \Magento\Wishlist\Model\ResourceModel\Item\CollectionFactory $currentUserWishlistCollectionFactory,
    	\Magento\Customer\Model\Session $Customersession,
        ) {
    	....
    	$this->_Customersession = $Customersession;
            $this->_currentUserWishlistCollectionFactory = $currentUserWishlistCollectionFactory;
    ....
            
        }
    
    public function getcurrentUserWishlistItems(){
    
    	$collection = $this->_currentUserWishlistCollectionFactory->create();
    	$collection->addCustomerIdFilter($this->_Customersession->getCustomerId());
    	return $collection;
    
    }