ACP2E-1194: Duplicate orders with 2 parallel GraphQL requests

Author: Anna Bukatar

app/code/Magento/QuoteGraphQl/etc/di.xml

@@ -8,6 +8,7 @@
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
     <preference for="Magento\QuoteGraphQl\Model\CartItem\DataProvider\CustomizableOptionValueInterface" type="Magento\QuoteGraphQl\Model\CartItem\DataProvider\CustomizableOptionValue\Composite" />
     <preference for="Magento\QuoteGraphQl\Model\CartItem\DataProvider\Processor\ItemDataProcessorInterface" type="Magento\QuoteGraphQl\Model\CartItem\DataProvider\Processor\ItemDataCompositeProcessor" />
+    <preference for="Magento\QuoteGraphQl\Model\Cart\PlaceOrderMutexInterface" type="Magento\QuoteGraphQl\Model\Cart\PlaceOrderMutex" />
     <type name="Magento\QuoteGraphQl\Model\Resolver\CartItemTypeResolver">
         <arguments>
             <argument name="supportedTypes" xsi:type="array">

app/code/Magento/QuoteGraphQl/etc/graphql/di.xml

@@ -12,8 +12,6 @@
                 type="Magento\QuoteGraphQl\Model\Cart\SetShippingMethodsOnCart"/>
     <preference for="Magento\QuoteGraphQl\Model\Cart\MergeCarts\CartQuantityValidatorInterface"
                 type="Magento\QuoteGraphQl\Model\Cart\MergeCarts\CartQuantityValidator"/>
-    <preference for="Magento\QuoteGraphQl\Model\Cart\PlaceOrderMutexInterface"
-                type="Magento\QuoteGraphQl\Model\Cart\PlaceOrderMutex" />
     <type name="Magento\QuoteGraphQl\Model\Cart\BuyRequest\BuyRequestBuilder">
         <arguments>
             <argument name="providers" xsi:type="array">