Default variable value not used

[jorrit]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

In Hot Chocolate v11 I could skip a variable with a default value, like in this query:

query test($a: Boolean = true, $b: Boolean = true) {
  apiInformation {
    version @include(if: $a)
    startDate @include(if: $b)
  }
}

In v12, this doesn't work

Steps to reproduce

1. Execute a query with a default value.
2. Observe this error:

{
  "errors": [
    {
      "message": "The variable with the name `a` does not exist."
    }
  ]
}

3. V11 has this output:

Relevant log output

{
  "data": {
    "apiInformation": {
      "version": "1.0.0.417",
      "startDate": "2021-10-04T09:34:52.186+02:00"
    }
  }
}

Additional Context?

No response

Product

Hot Chocolate

Version

12.0.1

[jorrit]

Extra note: when the variables are required, the following error is given in V12:

{
  "errors": [
    {
      "message": "Variable `a` is required.",
      "locations": [
        {
          "line": 1,
          "column": 12
        }
      ],
      "extensions": {
        "code": "HC0018",
        "variable": "a"
      }
    }
  ]
}

With V11, that query worked as well.