This is not a bug. It's misusing the API. If the URI mappers are used with the plan serializer, a SerializationCallback has to be registered which allows the plan serializer to retrieve the exact same mappers that were registered before.
This is not a bug. It's misusing the API. If the URI mappers are used with the plan serializer, a SerializationCa llback has to be registered which allows the plan serializer to retrieve the exact same mappers that were registered before.