Inheritance and repeating properties in child

I'm looking at generated examples and not sure if I understand why it works like this.
If you would take a look at https://github.com/swagger-api/swagger-codegen/blob/master/samples/client/petstore/csharp/SwaggerClient/src/IO.Swagger/Model/Cat.cs - you would see, that it inherits from Animal, which is ok.

Now the interesting thing is, that it repeats all the properties available in Animal - like ClassName, Color - which I can't understand - isn't the very purpose of inheritance to avoid repeating those properties? They even get compiler warnings, as such properties are already defined in base class and new modifier is not used.

That is not only in C# code generation, Java works the same. Is this by design?

Start with the generated samples/client/petstore/csharp/SwaggerClient/src/IO.Swagger/Model/Cat.cs and its Animal base class, then compare the corresponding Java output. Trace those generated properties back through the relevant code-generation templates and check whether the repeated declarations and compiler warnings are intentional. Done means establishing the expected inheritance behavior and documenting the precise scope of any generator change.