When polymorphism is present, csharp code has an issue on positional parameters

Description

CSharp client for framework 5.0 version.
When polymorphism is present, such as MyJob extends Job, MyJob constructor calls base constructor
with not named arguments, when these arguments are not optional.
This issue occurs when a parameter is Enum type and so it's required, not optional

public partial class Job :  IEquatable<Job>, IValidatableObject
{
  public Job(long? jobId = default(long?), JobStatusEnum? jobStatus = default(JobStatusEnum?), string name = default(string))
  {
  ...
  }
}

public partial class MyJob : Job,  IEquatable<MyJob>, IValidatableObject
{
  public MyJob(...) : base(jobStatus)
}

Swagger-codegen version

swagger-codegen-cli-2.4.0-20181007.065826-339

Suggest a fix/enhancement

public partial class MyJob : Job,  IEquatable<MyJob>, IValidatableObject
{
  public MyJob(...) : base(jobStatus: jobStatus)
}

Locate the C# code-generation template or entry point that emits constructors for polymorphic models, then compare the generated derived constructor with the reported Job/MyJob example. Verify that required enum parameters are handled correctly in the base-constructor call and that the generated C# compiles for this case.