magento-test/app/code/Magento/Wishlist/etc/adminhtml/di.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Wishlist\Model\Wishlist">
        <arguments>
            <argument name="useCurrentWebsite" xsi:type="boolean">false</argument>
        </arguments>
    </type>
    <virtualType name="Magento\Wishlist\Model\Session\Storage" type="Magento\Framework\Session\Storage">
        <arguments>
            <argument name="namespace" xsi:type="string">wishlist</argument>
        </arguments>
    </virtualType>
    <virtualType name="Magento\Wishlist\Model\Session" type="Magento\Framework\Session\Generic">
        <arguments>
            <argument name="storage" xsi:type="object">Magento\Wishlist\Model\Session\Storage</argument>
        </arguments>
    </virtualType>
    <type name="Magento\Catalog\Model\ResourceModel\Product">
        <plugin name="cleanups_wishlist_item_after_product_delete" type="Magento\Wishlist\Plugin\Model\ResourceModel\Product" />
    </type>
    <preference for="Magento\Wishlist\Model\ResourceModel\Item\Product\CollectionBuilderInterface"
                type="Magento\Wishlist\Model\Adminhtml\ResourceModel\Item\Product\CollectionBuilder"/>
</config>