Google Column Chart bug

columnchart.html

<script type="text/javascript" src="https://www.google.com/jsapi?autoload={'modules':[{'name':'visualization','version':'1.1','packages':['bar','corechart', 'gauge', 'annotatedtimeline', 'annotationchart']}]}"></script>
<script>
      google.setOnLoadCallback(drawChart);
      

var data = {"cols":[{"id":"","label":"Giorno","pattern":"","type":"date"},{"id":"","label":"CS Blindo 3 (kWh/Pz) ","pattern":"","type":"number"}],"rows":[{"c":[{"v":"Date(2019, 5, 3)","f":"03/06/19"},{"v":null}]},{"c":[{"v":"Date(2019, 5, 4)","f":"04/06/19"},{"v":1.15}]},{"c":[{"v":"Date(2019, 5, 5)","f":"05/06/19"},{"v":1.51}]},{"c":[{"v":"Date(2019, 5, 6)","f":"06/06/19"},{"v":0.97}]},{"c":[{"v":"Date(2019, 5, 7)","f":"07/06/19"},{"v":0.84}]},{"c":[{"v":"Date(2019, 5, 8)","f":"08/06/19"},{"v":0.9}]},{"c":[{"v":"Date(2019, 5, 9)","f":"09/06/19"},{"v":null}]}]}

var opt = {
  "hAxis":{
         "slantedText":true,
         "slantedTextAngle":45,
         "format":"dd/MM/yy",
         "ticks":[ 
             new Date("2019-06-02T22:00:00.000Z"),new Date("2019-06-03T22:00:00.000Z"),new Date("2019-06-04T22:00:00.000Z"),new Date("2019-06-05T22:00:00.000Z"),
             new Date("2019-06-06T22:00:00.000Z"),new Date("2019-06-07T22:00:00.000Z"),new Date("2019-06-08T22:00:00.000Z")]
         },
 "vAxis":{"minorGridlines":{"count":4}},
"title":"CS Blindo 3 (kWh/Pz) ",
"titleTextStyle":{"color":"black"},"position":"top","fontsize":"10px","chartArea":{"top":30,"height":"72%","width":"80%"},
"is3D":true,
"colors":["#147A88","#92D050","#FFC000","#dc3131","#cece95","#6699ff","#808080","#f6c7b6","#22556E","#fcf600","#5BA80F","#F700FF","#0070c0","#c8c8c8",
          "#9900ff","#A5A500","#474747","#00ffff","#960101","#f5b661"],
"animation":{"startup":true,"duration":1000,"easing":"out"},
"legend":{"position":"none"},
 "dateFormat":"dd/MM/yy"
 };

var DataTable =  new google.visualization.DataTable(data);

      
      function drawChart() {
        var chart =  new google.visualization.ColumnChart(document.getElementById('chart_div'));
        chart.draw(DataTable, opt);
      }

</script>


<div id="chart_div" style="height: 500px;"></div>