connectnulls not working properly with step chart

One-line summary [问题简述]

chart data with null for step charts. if we connect nulls using connectNulls property, it is showing as line chart not as step chart

Version & Environment [版本及环境]

• ECharts version [ECharts 版本]:
• Browser version [浏览器类型和版本]:
• OS Version [操作系统类型和版本]:

It should show as step chart

Expected behaviour [期望结果]

ECharts option [ECharts配置项]

option = {
    title: {
        text: 'Step Line'
    },
    tooltip: {
        trigger: 'axis'
    },
    legend: {
        data:['Step Start', 'Step Middle', 'Step End']
    },
    grid: {
        left: '3%',
        right: '4%',
        bottom: '3%',
        containLabel: true
    },
    toolbox: {
        feature: {
            saveAsImage: {}
        }
    },
    xAxis: {
        type: 'category',
        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
    },
    yAxis: {
        type: 'value'
    },
    series: [
        {
            name:'Step Start',
            type:'line',
            step: 'start',
            connectNulls:true,
            data:[120, null, 101, 134, 90, 230, 210]
        },
        {
            name:'Step Middle',
            type:'line',
            step: 'middle',
             connectNulls:true,
            data:[220, 282, 201, 234, null, 430, 410]
        },
        {
            name:'Step End',
            type:'line',
            step: 'end',
             connectNulls:true,
            data:[450, 432, 401, null, 590, 530, 510]
        }
    ]
};

Other comments [其他信息]

[cuijian-dexter]

It’s series[i].connectNulls instead of series[i].data[0].connectNulls.

[vimalraj-ponnusamy]

@cuijian-dexter @ovilia still not working nulls are not getting connected, it is the data given by you. i also tried adding the connectnulls to all data, but still same result

attached the image for your reference