diff -Nuar a/vendor/magento/module-persistent/Model/Checkout/GuestShippingInformationManagementPlugin.php b/vendor/magento/module-persistent/Model/Checkout/GuestShippingInformationManagementPlugin.php
new file mode 100644
index 00000000000..e78cae054e6
--- /dev/null
+++ b/vendor/magento/module-persistent/Model/Checkout/GuestShippingInformationManagementPlugin.php
@@ -0,0 +1,99 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Persistent\Model\Checkout;
+
+use Magento\Checkout\Api\Data\PaymentDetailsInterface;
+use Magento\Checkout\Model\GuestShippingInformationManagement;
+use Magento\Customer\Model\Session as CustomerSession;
+use Magento\Persistent\Helper\Data;
+use Magento\Persistent\Helper\Session as PersistentSession;
+use Magento\Persistent\Model\QuoteManager;
+
+/**
+ * Plugin to convert shopping cart from persistent cart to guest cart after shipping information saved
+ *
+ * @SuppressWarnings(PHPMD.CookieAndSessionMisuse)
+ */
+class GuestShippingInformationManagementPlugin
+{
+    /**
+     * Persistence Session Helper
+     *
+     * @var PersistentSession
+     */
+    private $persistenceSessionHelper;
+
+    /**
+     * Persistence Data Helper
+     *
+     * @var Data
+     */
+    private $persistenceDataHelper;
+
+    /**
+     * Customer Session
+     *
+     * @var CustomerSession
+     */
+    private $customerSession;
+
+    /**
+     * Quote Manager
+     *
+     * @var QuoteManager
+     */
+    private $quoteManager;
+
+    /**
+     * Initialize dependencies
+     *
+     * @param Data $persistenceDataHelper
+     * @param PersistentSession $persistenceSessionHelper
+     * @param CustomerSession $customerSession
+     * @param QuoteManager $quoteManager
+     */
+    public function __construct(
+        Data $persistenceDataHelper,
+        PersistentSession $persistenceSessionHelper,
+        CustomerSession $customerSession,
+        QuoteManager $quoteManager
+    ) {
+        $this->persistenceDataHelper = $persistenceDataHelper;
+        $this->persistenceSessionHelper = $persistenceSessionHelper;
+        $this->customerSession = $customerSession;
+        $this->quoteManager = $quoteManager;
+    }
+
+    /**
+     * Convert shopping cart from persistent cart to guest cart after shipping information saved
+     *
+     * Check if shopping cart is persistent and customer is not logged in, and only one payment method is available,
+     * then converts the shopping cart guest cart.
+     *
+     * @param GuestShippingInformationManagement $subject
+     * @param PaymentDetailsInterface $result
+     * @return PaymentDetailsInterface
+     * @SuppressWarnings(PHPMD.UnusedFormalParameter)
+     */
+    public function afterSaveAddressInformation(
+        GuestShippingInformationManagement $subject,
+        PaymentDetailsInterface $result
+    ): PaymentDetailsInterface {
+        if ($this->persistenceSessionHelper->isPersistent()
+            && !$this->customerSession->isLoggedIn()
+            && $this->persistenceDataHelper->isShoppingCartPersist()
+            && $this->quoteManager->isPersistent()
+            && count($result->getPaymentMethods()) === 1
+        ) {
+            $this->customerSession->setCustomerId(null);
+            $this->customerSession->setCustomerGroupId(null);
+            $this->quoteManager->convertCustomerCartToGuest();
+        }
+        return $result;
+    }
+}
diff -Nuar a/vendor/magento/module-persistent/Model/QuoteManager.php b/vendor/magento/module-persistent/Model/QuoteManager.php
index 8ae22e4c26c..529558f218f 100644
--- a/vendor/magento/module-persistent/Model/QuoteManager.php
+++ b/vendor/magento/module-persistent/Model/QuoteManager.php
@@ -5,8 +5,18 @@
  */
 namespace Magento\Persistent\Model;
 
+use Magento\Customer\Api\Data\CustomerInterfaceFactory;
+use Magento\Customer\Api\Data\GroupInterface;
+use Magento\Framework\App\ObjectManager;
+use Magento\Persistent\Helper\Data;
+use Magento\Quote\Api\CartRepositoryInterface;
+use Magento\Quote\Api\Data\CartExtensionFactory;
+use Magento\Quote\Api\Data\CartInterface;
+use Magento\Quote\Model\Quote;
+use Magento\Quote\Model\Quote\ShippingAssignment\ShippingAssignmentProcessor;
+
 /**
- * Class QuoteManager
+ * Quote manager model
  *
  * @SuppressWarnings(PHPMD.CookieAndSessionMisuse)
  */
@@ -29,7 +39,7 @@ class QuoteManager
     /**
      * Persistent data
      *
-     * @var \Magento\Persistent\Helper\Data
+     * @var Data
      */
     protected $persistentData;
 
@@ -41,26 +51,52 @@ class QuoteManager
     protected $_setQuotePersistent = true;
 
     /**
-     * @var \Magento\Quote\Api\CartRepositoryInterface
+     * @var CartRepositoryInterface
      */
     protected $quoteRepository;
 
     /**
+     * @var ShippingAssignmentProcessor
+     */
+    private $shippingAssignmentProcessor;
+    /**
+     * @var CartExtensionFactory
+     */
+    private $cartExtensionFactory;
+
+    /**
+     * @var CustomerInterfaceFactory
+     */
+    private $customerDataFactory;
+
+    /**
      * @param \Magento\Persistent\Helper\Session $persistentSession
-     * @param \Magento\Persistent\Helper\Data $persistentData
+     * @param Data $persistentData
      * @param \Magento\Checkout\Model\Session $checkoutSession
-     * @param \Magento\Quote\Api\CartRepositoryInterface $quoteRepository
+     * @param CartRepositoryInterface $quoteRepository
+     * @param CartExtensionFactory|null $cartExtensionFactory
+     * @param ShippingAssignmentProcessor|null $shippingAssignmentProcessor
+     * @param CustomerInterfaceFactory|null $customerDataFactory
      */
     public function __construct(
         \Magento\Persistent\Helper\Session $persistentSession,
-        \Magento\Persistent\Helper\Data $persistentData,
+        Data $persistentData,
         \Magento\Checkout\Model\Session $checkoutSession,
-        \Magento\Quote\Api\CartRepositoryInterface $quoteRepository
+        CartRepositoryInterface $quoteRepository,
+        ?CartExtensionFactory $cartExtensionFactory = null,
+        ?ShippingAssignmentProcessor $shippingAssignmentProcessor = null,
+        ?CustomerInterfaceFactory $customerDataFactory = null
     ) {
         $this->persistentSession = $persistentSession;
         $this->persistentData = $persistentData;
         $this->checkoutSession = $checkoutSession;
         $this->quoteRepository = $quoteRepository;
+        $this->cartExtensionFactory = $cartExtensionFactory
+            ?? ObjectManager::getInstance()->get(CartExtensionFactory::class);
+        $this->shippingAssignmentProcessor = $shippingAssignmentProcessor
+            ?? ObjectManager::getInstance()->get(ShippingAssignmentProcessor::class);
+        $this->customerDataFactory = $customerDataFactory
+            ?? ObjectManager::getInstance()->get(CustomerInterfaceFactory::class);
     }
 
     /**
@@ -71,7 +107,7 @@ class QuoteManager
      */
     public function setGuest($checkQuote = false)
     {
-        /** @var $quote \Magento\Quote\Model\Quote */
+        /** @var $quote Quote */
         $quote = $this->checkoutSession->getQuote();
         if ($quote && $quote->getId()) {
             if ($checkQuote && !$this->persistentData->isShoppingCartPersist() && !$quote->getIsPersistent()) {
@@ -82,23 +118,40 @@ class QuoteManager
             $quote->getPaymentsCollection()->walk('delete');
             $quote->getAddressesCollection()->walk('delete');
             $this->_setQuotePersistent = false;
+            $this->cleanCustomerData($quote);
             $quote->setIsActive(true)
-                ->setCustomerId(null)
-                ->setCustomerEmail(null)
-                ->setCustomerFirstname(null)
-                ->setCustomerLastname(null)
-                ->setCustomerGroupId(\Magento\Customer\Api\Data\GroupInterface::NOT_LOGGED_IN_ID)
                 ->setIsPersistent(false)
-                ->setCustomerIsGuest(true)
                 ->removeAllAddresses();
             //Create guest addresses
-            $quote->getShippingAddress();
+            $this->setShippingAssignments($quote);
             $quote->getBillingAddress();
             $quote->collectTotals();
             $this->quoteRepository->save($quote);
         }
 
         $this->persistentSession->getSession()->removePersistentCookie();
+        $this->persistentSession->setSession(null);
+    }
+
+    /**
+     * Clear customer data in quote
+     *
+     * @param Quote $quote
+     */
+    private function cleanCustomerData($quote)
+    {
+        /**
+         * Set empty customer object in quote to avoid restore customer id
+         * @see Quote::beforeSave()
+         */
+        if ($quote->getCustomerId()) {
+            $quote->setCustomer($this->customerDataFactory->create());
+        }
+        $quote->setCustomerId(null)
+            ->setCustomerEmail(null)
+            ->setCustomerFirstname(null)
+            ->setCustomerLastname(null)
+            ->setCustomerGroupId(GroupInterface::NOT_LOGGED_IN_ID);
     }
 
     /**
@@ -112,7 +165,7 @@ class QuoteManager
     public function convertCustomerCartToGuest()
     {
         $quoteId = $this->checkoutSession->getQuoteId();
-        /** @var $quote \Magento\Quote\Model\Quote */
+        /** @var $quote Quote */
         $quote = $this->quoteRepository->get($quoteId);
         if ($quote && $quote->getId()) {
             $this->_setQuotePersistent = false;
@@ -128,6 +181,7 @@ class QuoteManager
             $quote->getAddressesCollection()->walk('setEmail', ['email' => null]);
             $quote->collectTotals();
             $this->persistentSession->getSession()->removePersistentCookie();
+            $this->persistentSession->setSession(null);
             $this->quoteRepository->save($quote);
         }
     }
@@ -146,7 +200,7 @@ class QuoteManager
             $quote->setIsActive(true)
                 ->setIsPersistent(false)
                 ->setCustomerId(null)
-                ->setCustomerGroupId(\Magento\Customer\Api\Data\GroupInterface::NOT_LOGGED_IN_ID);
+                ->setCustomerGroupId(GroupInterface::NOT_LOGGED_IN_ID);
         }
     }
 
@@ -159,4 +213,23 @@ class QuoteManager
     {
         return $this->_setQuotePersistent;
     }
+
+    /**
+     * Create shipping assignment for shopping cart
+     *
+     * @param CartInterface $quote
+     */
+    private function setShippingAssignments(CartInterface $quote): void
+    {
+        $shippingAssignments = [];
+        if (!$quote->isVirtual() && $quote->getItemsQty() > 0) {
+            $shippingAssignments[] = $this->shippingAssignmentProcessor->create($quote);
+        }
+        $cartExtension = $quote->getExtensionAttributes();
+        if ($cartExtension === null) {
+            $cartExtension = $this->cartExtensionFactory->create();
+        }
+        $cartExtension->setShippingAssignments($shippingAssignments);
+        $quote->setExtensionAttributes($cartExtension);
+    }
 }
diff -Nuar a/vendor/magento/module-persistent/Observer/MakePersistentQuoteGuestObserver.php b/vendor/magento/module-persistent/Observer/MakePersistentQuoteGuestObserver.php
index 94726bc9b1d..6618a041cbc 100644
--- a/vendor/magento/module-persistent/Observer/MakePersistentQuoteGuestObserver.php
+++ b/vendor/magento/module-persistent/Observer/MakePersistentQuoteGuestObserver.php
@@ -1,6 +1,5 @@
 <?php
 /**
- *
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
@@ -32,26 +31,26 @@ class MakePersistentQuoteGuestObserver implements ObserverInterface
     protected $_persistentData = null;
 
     /**
-     * @var \Magento\Persistent\Model\QuoteManager
+     * @var \Magento\Checkout\Model\Session
      */
-    protected $quoteManager;
+    private $checkoutSession;
 
     /**
      * @param \Magento\Persistent\Helper\Session $persistentSession
      * @param \Magento\Persistent\Helper\Data $persistentData
      * @param \Magento\Customer\Model\Session $customerSession
-     * @param \Magento\Persistent\Model\QuoteManager $quoteManager
+     * @param \Magento\Checkout\Model\Session $checkoutSession
      */
     public function __construct(
         \Magento\Persistent\Helper\Session $persistentSession,
         \Magento\Persistent\Helper\Data $persistentData,
         \Magento\Customer\Model\Session $customerSession,
-        \Magento\Persistent\Model\QuoteManager $quoteManager
+        \Magento\Checkout\Model\Session $checkoutSession
     ) {
         $this->_persistentSession = $persistentSession;
         $this->_persistentData = $persistentData;
         $this->_customerSession = $customerSession;
-        $this->quoteManager = $quoteManager;
+        $this->checkoutSession = $checkoutSession;
     }
 
     /**
@@ -68,7 +67,7 @@ class MakePersistentQuoteGuestObserver implements ObserverInterface
             if ((($this->_persistentSession->isPersistent() && !$this->_customerSession->isLoggedIn())
                 || $this->_persistentData->isShoppingCartPersist())
             ) {
-                $this->quoteManager->setGuest(true);
+                $this->checkoutSession->clearQuote()->clearStorage();
             }
         }
     }
diff -Nuar a/vendor/magento/module-persistent/Observer/RemoveGuestPersistenceOnEmptyCartObserver.php b/vendor/magento/module-persistent/Observer/RemoveGuestPersistenceOnEmptyCartObserver.php
index fe754711c91..efc9ecd4c1a 100644
--- a/vendor/magento/module-persistent/Observer/RemoveGuestPersistenceOnEmptyCartObserver.php
+++ b/vendor/magento/module-persistent/Observer/RemoveGuestPersistenceOnEmptyCartObserver.php
@@ -10,6 +10,8 @@ use Magento\Framework\Exception\NoSuchEntityException;
 
 /**
  * Observer to remove persistent session if guest empties persistent cart previously created and added to by customer.
+ *
+ * @SuppressWarnings(PHPMD.CookieAndSessionMisuse)
  */
 class RemoveGuestPersistenceOnEmptyCartObserver implements ObserverInterface
 {
@@ -96,6 +98,8 @@ class RemoveGuestPersistenceOnEmptyCartObserver implements ObserverInterface
         }
 
         if (!$cart || $cart->getItemsCount() == 0) {
+            $this->customerSession->setCustomerId(null)
+                ->setCustomerGroupId(null);
             $this->quoteManager->setGuest();
         }
     }
diff -Nuar a/vendor/magento/module-persistent/etc/frontend/di.xml b/vendor/magento/module-persistent/etc/frontend/di.xml
index 3c33f8a51c4..24663f5ab4f 100644
--- a/vendor/magento/module-persistent/etc/frontend/di.xml
+++ b/vendor/magento/module-persistent/etc/frontend/di.xml
@@ -49,4 +49,9 @@
             </argument>
         </arguments>
     </type>
+    <type name="Magento\Persistent\Model\QuoteManager">
+        <arguments>
+            <argument name="shippingAssignmentProcessor" xsi:type="object">Magento\Quote\Model\Quote\ShippingAssignment\ShippingAssignmentProcessor\Proxy</argument>
+        </arguments>
+    </type>
 </config>
diff -Nuar a/vendor/magento/module-persistent/etc/webapi_rest/di.xml b/vendor/magento/module-persistent/etc/webapi_rest/di.xml
index e955dd81b19..cb0aec6b460 100644
--- a/vendor/magento/module-persistent/etc/webapi_rest/di.xml
+++ b/vendor/magento/module-persistent/etc/webapi_rest/di.xml
@@ -9,4 +9,8 @@
     <type name="Magento\Checkout\Model\GuestPaymentInformationManagement">
         <plugin name="inject_guest_address_for_nologin" type="Magento\Persistent\Model\Checkout\GuestPaymentInformationManagementPlugin" />
     </type>
+    <type name="Magento\Checkout\Model\GuestShippingInformationManagement">
+        <plugin name="persistent_convert_customer_cart_to_guest_cart"
+                type="Magento\Persistent\Model\Checkout\GuestShippingInformationManagementPlugin"/>
+    </type>
 </config>
diff -Nuar a/vendor/magento/module-persistent/etc/webapi_soap/di.xml b/vendor/magento/module-persistent/etc/webapi_soap/di.xml
index e955dd81b19..cb0aec6b460 100644
--- a/vendor/magento/module-persistent/etc/webapi_soap/di.xml
+++ b/vendor/magento/module-persistent/etc/webapi_soap/di.xml
@@ -9,4 +9,8 @@
     <type name="Magento\Checkout\Model\GuestPaymentInformationManagement">
         <plugin name="inject_guest_address_for_nologin" type="Magento\Persistent\Model\Checkout\GuestPaymentInformationManagementPlugin" />
     </type>
+    <type name="Magento\Checkout\Model\GuestShippingInformationManagement">
+        <plugin name="persistent_convert_customer_cart_to_guest_cart"
+                type="Magento\Persistent\Model\Checkout\GuestShippingInformationManagementPlugin"/>
+    </type>
 </config>