Area isn't rendered properly for dynamic loading

[netil]

Description

Area type not showing correctly for dynamic loading using .load().

Steps to check or reproduce

var chart = bb.generate({
    bindto: "#chart",
    data: {
        columns: [
            ["data1", 30, 200, 100, 170, 150, 250],
        ],
        type: "line"
    }
});

setTimeout(() => {
  chart.load({
      columns: [
          ["data1", 100, 200, 300]
      ],
      type: "area"
  })
}, 2000);