Genson Issue with selectively including class meta data into only polymorphic classes

GensonIssue.scala

import com.owlike.genson.{ GensonBuilder, ScalaBundle, ScalaGenson }
import org.scalatest.{ Matchers, WordSpecLike }

trait GenericType {
  def providerId: Int
}

class SpecialisedTypeA(
  val providerId: Int,
  val sourceEntityId: String
) extends GenericType

class SpecialisedTypeB(
  val providerId: Int,
  val flag: Boolean
) extends GenericType

case class SomeOtherStaticType(name: String, age: Int)

class GensonIssue extends WordSpecLike with Matchers {

  val genson = new ScalaGenson(
    new GensonBuilder()
      .withBundle(ScalaBundle())
      .useIndentation(true)
      //.useRuntimeType(true)
      .useClassMetadata(true)
      .useClassMetadataWithStaticType(false)
      //.addAlias("SpeTypA", classOf[SpecialisedTypeA])
      .create()
  )

  val staticType = SomeOtherStaticType("test", 99)
  val instanceOfAEntity = new SpecialisedTypeA(123, "one")
  val instanceOfIEntity: GenericType = new SpecialisedTypeB(456, true)

  "Genson" must {
    "Serialize and Deserialize entity" in {

      println(genson.toJson(staticType))
      println(genson.toJson(instanceOfAEntity))

      genson.fromJson[SomeOtherStaticType](genson.toJson(staticType)) shouldBe staticType
      genson.fromJson[GenericType](genson.toJson(instanceOfAEntity)) shouldBe instanceOfAEntity
    }
  }
}