NullValue{} in generated code

[mores]

( Please be kind, I am just getting started with graphql )

1. I downloaded schema.json from my service provider.
2. I used graphql-introspection-json-to-sdl to convert it to schema.graphql
3. I used graphqlcodegen-maven-plugin ( 1.61.5 ) to generate java objects.
   At this point the objects will not compile - it complains about:
   private Integer maximum = NullValue{};

I get this same error when using gradle:
id "com.netflix.dgs.codegen" version "6.3.0" and "7.0.3"

Is this a bug with the codegen or a lack of configuration ?
I did look over: https://netflix.github.io/dgs/generating-code-from-schema/

[mores]

Perhaps I logged this bug in the wrong project.
See also: Netflix/dgs-codegen#770