Found A => A instead of missing given instance

main.scala

//> using scala 3.3.5

trait StreamArnFor[A] {
  val name: String
}

object api { 

  def expect[
      CompanionObject,
      EventType
  ](
      eventTag: CompanionObject,
      partitionKey: Option[String] = None
  )(
      condition: EventType => Boolean
  )(using
      withIsTest: EventType => { val isTest: Boolean },
      streamArnFor: StreamArnFor[EventType],
  ): Option[EventType] = ???
}


case class MyEvent(id: String, isTest: Boolean)
object MyEvent {
  val metadata = "some metadata"
}

@main
def main() = {
  api.expect(MyEvent){ (event: MyEvent) => event.id.nonEmpty }
}