Persistence with Jackson trying to cast all Map keys to String

scalaVersion "2.13.1" akkaVersion = "2.6.1"

akka {
  actor {
    serializers {
      jackson-json = "akka.serialization.jackson.JacksonJsonSerializer"
      jackson-cbor = "akka.serialization.jackson.JacksonCborSerializer"
    }
    serialization-bindings {
      "xxx.CborSerializable" = jackson-cbor
    }
  }
}

trait CborSerializable

final case class State(data:Map[Long,List[String]]) extends CborSerializable

// persist something with typed persistent actor.  eg. 42 -> List() 
// after snapshot recovery 

state.data.get(42) // should be Some, but it is None

state.data.find(_._1 == 42) // throws ex

Exception is

class java.lang.String cannot be cast to class java.lang.Long (java.lang.String and java.lang.Long are in module java.base of loader 'bootstrap') java.lang.ClassCastException: class java.lang.String cannot be cast to class java.lang.Long (java.lang.String and java.lang.Long are in module java.base of loader 'bootstrap')