[Dart] Unable to generate fromJson method for list of date time

If the swagger response contains a list of DateTime objects, It generates the wrong method for parsing from JSON.

For example for the below JSON:

{
  "dates" : [ ... ]
}

It generates:

 MyDto.fromJson(Map<String, dynamic> json) {
    if (json == null) return;
    dates =
      DateTime.listFromJson(json['dates']);
  }

So, the DateTime has no listFromJson method.

I'm using the online editor to generate dart client code.

Reproduce the example in the online editor and inspect the generated Dart deserialization for a list of DateTime values. Trace the generator template or entry point responsible for this output; done means the generated fromJson method uses a valid way to parse the dates list without calling DateTime.listFromJson.