[Kotlin] enum generation

Description

I am generating kotlin data classes from a swagger.json file.
among others there are enums to generate.

Unfortunately java and kotlin-client languages seem to duffer using the same enumPropertyNaming="UPPERCASE"

Swagger-codegen version

io.swagger.codegen.v3:swagger-codegen-cli:3.0.13

Swagger declaration file content or url

In this zip you can fing the sample.json swagger file and the swagger-config.json as well as the Outputs for java and kotlin-client
files.zip

Command line used for generation

I used the gradle swagger codegen plugin

Steps to reproduce

when using language"java" with enumPropertyNaming="UPPERCASE", it does the correct conversion.
SOME_ENUM -> SOME_ENUM
some other enum -> SOME_OTHER_ENUM

But when I use the same thing with language kotlin-client, I get a different outcome:
SOME_ENUM -> SOMEENUM <- I would expect the value from the java language
some other enum -> SOME_OTHER_ENUM

I would expect the same outcome as I get when using the java language though.

Suggest a fix/enhancement

Not sure how to fix it, but as I said above I would expect the languages to behave the same way.

Is there maybe a known workaround for this? E.g. use a different version of the codegen-cli?

Many thanks