Patch-Magento_Quote-M2.2.0-2.2.3-totals-extension-attributes.patch

--- Model/Cart/CartTotalRepository.php
+++ Model/Cart/CartTotalRepository.php
@@ -10,6 +10,7 @@
 use Magento\Quote\Api\CartTotalRepositoryInterface;
 use Magento\Catalog\Helper\Product\ConfigurationPool;
 use Magento\Framework\Api\DataObjectHelper;
+use Magento\Framework\Api\ExtensibleDataInterface;
 use Magento\Quote\Model\Cart\Totals\ItemConverter;
 use Magento\Quote\Api\CouponManagementInterface;

@@ -94,6 +95,7 @@ public function get($cartId)
             $addressTotalsData = $quote->getShippingAddress()->getData();
             $addressTotals = $quote->getShippingAddress()->getTotals();
         }
+        unset($addressTotalsData[ExtensibleDataInterface::EXTENSION_ATTRIBUTES_KEY]);

         /** @var \Magento\Quote\Api\Data\TotalsInterface $quoteTotals */
         $quoteTotals = $this->totalsFactory->create();