Simple Login Mutation does not work with ‘The query is too complex error’

[jp052]

Hi, I am having issues executing graphql mutations that are added to the mesh via the graphql handler. There is no transformation happening, it should just delegate the mutation to that endpoint as it is. Queries work as expected.

The error is stating the query is too complex. The full error log you can find below.
Executing the same query to the graphql endpoint via postman works as expected (see Postman screenshot).
Any help on what could be going wrong here, or what is missing would be appreciated.
Below are all relevant screenshots, versions and configurations.

meshrc.yml configuration:
  - name: BigCommerce
    handler:
      graphql:
        endpoint: ${ENDPOINT}
        schemaHeaders:
          Authorization: bearer {env.API_TOKEN}
          X-Auth-Token: ${X_AUTH_TOKEN}
        operationHeaders:
          Authorization: bearer {env.API_TOKEN}
          X-Auth-Token: ${X_AUTH_TOKEN}

Query:

mutation Login($email: String!, $password: String!) {
  login(email: $email, password: $password) {
    customer {
      firstName
    }
  }
}

Query Variables:

{
  "email": "[email protected]",
  "password": "myPassword"
}

Package.json:

{
    "name": "app",
    "version": "0.1.0",
    "private": true,
    "license": "UNLICENSED",
    "devDependencies": {
      "@graphql-mesh/cli": "0.69.x"
    },
    "dependencies": {
      "@graphql-mesh/cache-localforage": "0.6.x",
      "@graphql-mesh/graphql": "0.25.x",
      "@graphql-mesh/merger-stitching": "0.15.x",
      "@graphql-mesh/openapi": "0.25.x",
      "@graphql-mesh/runtime": "0.34.x",
      "@graphql-mesh/transform-cache": "0.12.x",
      "@graphql-mesh/json-schema": "0.28.x",
      "graphql": "16.4.x"
    },
    "peerDependencies": {
      "graphql-tag": "^2.0.0",
      "react-native": "latest",
      "@types/node": "latest"
    }
}

Error log screenshot:

Playground screenshot:

Postman screenshot: