AWS S3/Tck can't retrive value null with JSON format

1- Miss the field 'birthday' when the value is null
Source data

{"id":1,"name":"Calin","age":10.3,"birthday":null,"Is_it_girl":true}

refer to screenshot 'viewsampleoneobject1.png'
2- The file jsons3.json was generated by the output of s3 connector
Failed to view sample, refer to screenshot 'viewsample.png'