json-smart serialization fails without setter - treats bean field without setter as public

ReproTest.java

import net.minidev.json.JSONObject;

import java.util.HashMap;
import java.util.Map;

public class ReproTest {
    public static void main(String[] args) {
        MyData data = new MyData("a");
        Map<String, Object> m = new HashMap<>();
        m.put("data", data);
        System.out.println(new JSONObject(m));
    }

    public static class MyData {
        private String someField;

        public MyData(String someField) {
            this.someField = someField;
        }

        public String getSomeField() {
            return someField;
        }
        
        // Remove comment to make serialization to work
        /*
        public void setSomeField(String someField) {
            this.someField = someField;
        }
         */
    }
}