Upward Connector sets preference for "Magento\Framework\App\FrontControllerInterface" As type="Magento\UpwardConnector\Controller\Upward"
Magento_GraphQl module sets preference for Magento\Framework\App\FrontControllerInterface as type=Magento\GraphQl\Controller\GraphQl when frontName=graphql
For all GraphQL requests, area code is set as "graphql". As a result, graphql queries are not handled by upwards connector.
Adding preference definition for graphql frontName fix this issue.
Upward Connector sets preference for "Magento\Framework\App\FrontControllerInterface" As type="Magento\UpwardConnector\Controller\Upward"
Magento_GraphQl module sets preference for Magento\Framework\App\FrontControllerInterface as type=Magento\GraphQl\Controller\GraphQl when frontName=graphql
For all GraphQL requests, area code is set as "graphql". As a result, graphql queries are not handled by upwards connector.
Adding preference definition for graphql frontName fix this issue.