DefineAuthChallenge lambda is called with incorrect request session

Platform
1

We have a CUSTOM_AUTH flow set up, and when we call initiateAuth method of Cognito API, DefineAuthChallenge lambda function gets called with an event:

{
  "version": "$LATEST",
  "triggerSource": "DefineAuthChallenge_Authentication",
  "userName": "+12136185086",
  "region": "us-west-2",
  "userPoolId": "us-west-2_3059f26f871448f6b709cbcb1ea2d1c5",
  "callerContext": {
    "awsSdkVersion": "aws-sdk-unknown-unknown",
    "clientId": "knpedd2zvd7zz70mzv06ge5kax"
  },
  "request": {
    "session": [
      {
        "challengeName": null,
        "challengeResult": true, // it shouldn't be true, since it is a first call
        "challengeMetadata": null
      }
    ],
    "userAttributes": {
      "name": "Lscwb Kczxc",
      "phone_number": "+12136185086",
      "phone_number_verified": "true",
      "sub": "430ff8de-cdd5-4da5-94b5-5744625aabac",
      "cognito:user_status": "CONFIRMED"
    }
  },
  "response": {
    "challengeName": null,
    "failAuthentication": null,
    "issueTokens": null
  }
}

challengeResult is not supposed to be true right away, the user should pass the authorization challenge first.

2

A fix for this issue has been pushed to the last image of LocalStack. You can update your image by running localstack update docker-images or docker pull localstack/localstack:latest