Custom generator no longer seems to work about gradle-swagger-generator-plugin HOT 4 OPEN

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':generateSwaggerCodePetstore'.
(snip)

Caused by: java.lang.RuntimeException: Error while running swagger-codegen-cli
(snip)

Caused by: java.lang.RuntimeException: Can't load config class with name generators.MySpring Available: ...
(snip)

Caused by: java.lang.ClassCastException: generators.MySpring cannot be cast to io.swagger.codegen.v3.CodegenConfig
	at io.swagger.codegen.v3.CodegenConfigLoader.forName(CodegenConfigLoader.java:29)
	... 2 more

...
code.configuration = project.buildscript.configurations.getByName("classpath")
...

implementation("io.swagger:swagger-codegen:$swaggerVersion") { exclude("org.slf4", "sl4j-simple") }
swaggerCodegen("io.swagger:swagger-codegen-cli:$swaggerVersion")

dependencies {
    swaggerCodegen("com.myorg.generator:my-swagger-generator:3.7.0-SNAPSHOT@jar")
}` 


for tests (using junit & testkit), i did:

`    val SWAGGER_TEST_CASE = """
import org.hidetake.gradle.swagger.generator.GenerateSwaggerCode
plugins {
    `kotlin-dsl`
    `maven-publish`
    id("com.myorg.service-conventions") version "+"
}

repositories {
    gradlePluginPortal()
    mavenCentral()
}

dependencies {
    swaggerCodegen("com.myorg:my-swagger-generator:3.7.0-SNAPSHOT@jar")
}

swaggerSources {
    register("swagger-test-plugin") {
        // Need to save a reference of it here because the `this` scope changes below.
        val validationTask = validation

        val yamlResourceDir = sourceSets.test.get().resources.srcDirs.first().path

        println("test using resource dir ${'$'}yamlResourceDir ")
        val yamlDir = "${'$'}yamlResourceDir/yaml"

        println("test yamlDir is ${'$'}yamlDir")
        setInputFile(file("${'$'}yamlDir/test.yaml"))

        code(delegateClosureOf<GenerateSwaggerCode> {
            language = "com.myorg.generator.swagger.MySpringCodegen"
            outputDir = file("build/generated")
            components = listOf("models")

            dependsOn(validationTask, tasks.named("build")
             , project.getTasksByName("my-swagger-generator:jar", true))
        })
    }
}