multiple mutations always returns errors

[sereinity]

But the action were performed, here is a formated version of the typical response

{
  "errors": [
    {
      "debugMessage": "Argument 1 passed to App\\UserInterface\\GraphQL\\ResolverMap\\ResolverMap::App\\UserInterface\\GraphQL\\ResolverMap\\{closure}() must be an instance of App\\UserInterface\\GraphQL\\ResolverMap\\mixed, instance of App\\UserInterface\\GraphQL\\Map\\St
artServiceSuccessOutputDTO given, called in /app/vendor/webonyx/graphql-php/src/Type/Definition/UnionType.php on line 124",
      "message": "Internal server Error",
      "extensions": {
        "category": "internal"
      },
      "locations": [
        {
          "line": 3,
          "column": 7
        }
      ],
      "path": [
        "startService"
      ],
      "trace": [
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Type/Definition/UnionType.php",
          "line": 124,
          "call": "App\\UserInterface\\GraphQL\\ResolverMap\\ResolverMap::App\\UserInterface\\GraphQL\\ResolverMap\\{closure}()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php",
          "line": 940,
          "call": "GraphQL\\Type\\Definition\\UnionType::resolveType()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php",
          "line": 789,
          "call": "GraphQL\\Executor\\ReferenceExecutor::completeAbstractValue()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php",
          "line": 741,
          "call": "GraphQL\\Executor\\ReferenceExecutor::completeValue()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php",
          "line": 654,
          "call": "GraphQL\\Executor\\ReferenceExecutor::completeValue()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php",
          "line": 557,
          "call": "GraphQL\\Executor\\ReferenceExecutor::completeValueCatchingError()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php",
          "line": 474,
          "call": "GraphQL\\Executor\\ReferenceExecutor::resolveField()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php",
          "line": 857,
          "call": "GraphQL\\Executor\\ReferenceExecutor::GraphQL\\Executor\\{closure}()"
        },
        {
          "call": "GraphQL\\Executor\\ReferenceExecutor::GraphQL\\Executor\\{closure}()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php",
          "line": 859,
          "function": "array_reduce()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php",
          "line": 490,
          "call": "GraphQL\\Executor\\ReferenceExecutor::promiseReduce()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php",
          "line": 263,
          "call": "GraphQL\\Executor\\ReferenceExecutor::executeFieldsSerially()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php",
          "line": 215,
          "call": "GraphQL\\Executor\\ReferenceExecutor::executeOperation()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/Executor/Executor.php",
          "line": 156,
          "call": "GraphQL\\Executor\\ReferenceExecutor::doExecute()"
        },
        {
          "file": "/app/vendor/webonyx/graphql-php/src/GraphQL.php",
          "line": 162,
          "call": "GraphQL\\Executor\\Executor::promiseToExecute()"
        },
        {
          "file": "/app/vendor/overblog/graphql-bundle/src/Executor/Executor.php",
          "line": 43,
          "call": "GraphQL\\GraphQL::promiseToExecute()"
        },
        {
          "file": "/app/vendor/overblog/graphql-bundle/src/Request/Executor.php",
          "line": 165,
          "call": "Overblog\\GraphQLBundle\\Executor\\Executor::execute()"
        },
        {
          "file": "/app/vendor/overblog/graphql-bundle/src/Controller/GraphController.php",
          "line": 116,
          "call": "Overblog\\GraphQLBundle\\Request\\Executor::execute()"
        },
        {
          "file": "/app/vendor/overblog/graphql-bundle/src/Controller/GraphController.php",
          "line": 88,
          "call": "Overblog\\GraphQLBundle\\Controller\\GraphController::processNormalQuery()"
        },
        {
          "file": "/app/vendor/overblog/graphql-bundle/src/Controller/GraphController.php",
          "line": 64,
          "call": "Overblog\\GraphQLBundle\\Controller\\GraphController::processQuery()"
        },
        {
          "file": "/app/vendor/overblog/graphql-bundle/src/Controller/GraphController.php",
          "line": 42,
          "call": "Overblog\\GraphQLBundle\\Controller\\GraphController::createResponse()"
        },
        {
          "file": "/app/vendor/symfony/http-kernel/HttpKernel.php",
          "line": 152,
          "call": "Overblog\\GraphQLBundle\\Controller\\GraphController::endpointAction()"
        },
        {
          "file": "/app/vendor/symfony/http-kernel/HttpKernel.php",
          "line": 74,
          "call": "Symfony\\Component\\HttpKernel\\HttpKernel::handleRaw()"
        },
        {
          "file": "/app/vendor/symfony/http-kernel/Kernel.php",
          "line": 202,
          "call": "Symfony\\Component\\HttpKernel\\HttpKernel::handle()"
        },
        {
          "file": "/app/public/index.php",
          "line": 25,
          "call": "Symfony\\Component\\HttpKernel\\Kernel::handle()"
        }
      ]
    }
  ]
}