Highcharts Gantt Chart First/Last row content not readable while Fixed Header

问题

I am having issue while implementing gantt charts with fixed header with

yAxis: {
    scrollbar: {
        enabled: true,
        liveRedraw: true
    }
}

Content of last row when scrolling down or first row when scrolling up becomes invisible until the scroll is finished.

You can check the live demo at: https://jsfiddle.net/8c93a6me/

来源：https://stackoverflow.com/questions/61076229/highcharts-gantt-chart-first-last-row-content-not-readable-while-fixed-header