useAbstractionForFiles OpenAPI WebClient not working

Question

I am using OpenAPI generator (Gradle plugin version 5.4.0) to generate a few API calls. One of said calls, revolves a file download from an external service i.e my application calls that one and downloads and then should proxy the event. For that API call my returned content-type is set to application-zip. When invoking that API directly (i.e from a browser) everything works OK.

Using that API definition, I am trying to generate a WebClient to be used by another project that will effectively download that file. Doing so I am facing the following problems:

1. Whenever I try to invoke the API to download the file I am getting the following error: nested exception is org.springframework.web.reactive.function.UnsupportedMediaTypeException: Content type 'application/zip' not supported for bodyType=java.io.File

2. My generated WebClient seems to return a Mono<File> instead of some other object instance. I tried to disable this behavior by setting the following openapi generator configuration option useAbstractionForFiles but is seems to get ignored.

Can anyone shed some light as to how I can resolve this issue? For reference here is my OpenAPI Gradle Plugin configuration options:

    configOptions = [
            dateLibrary            : 'java8',
            serializationLibrary   : 'jackson',
            library                : 'webclient',
            useAbstractionForFiles : 'true',
            useBeanValidation      : "true",
            interfaceOnly          : "true",
            serializableModel      : "true",
            useTags                : "true",
            reactive               : "true",
            sourceFolder           : 'src/main/java',
            testFolder             : 'src/test/java'
    ]