分段绘制颜色点的连接处颜色混乱echarts 折线配置项内容和展示

分段绘制颜色点的连接处颜色混乱,而且分段越多越明显,有时甚至线段之前的颜色应该是红色结果却是蓝色

配置项如下
      option = {
    title: {
        text: '一天用电量分布',
        subtext: '纯属虚构'
    },
    tooltip: {
        trigger: 'axis',
        axisPointer: {
            type: 'cross'
        }
    },
    toolbox: {
        show: true,
        feature: {
            saveAsImage: {}
        }
    },
    xAxis:  {
        type: 'category',
        boundaryGap: false,
        data: ['00:00', '01:15', '02:30', '03:45', '05:00', '06:15', '07:30', '08:45', '10:00', '11:15', '12:30', '13:45', '15:00', '16:15', '17:30', '18:45', '20:00', '21:15', '22:30', '23:45']
    },
    yAxis: {
        type: 'value',
        axisLabel: {
            formatter: '{value} W'
        },
        axisPointer: {
            snap: true
        }
    },
    visualMap: {
        show: false,
        dimension: 0,
        pieces:[{
	"lte": 0,
	"color": "#4085e5"
}, {
	"gt": 0,
	"lte": 1,
	"color": "red"
}, {
	"gt": 1,
	"lte": 2,
	"color": "red"
}, {
	"gt": 2,
	"lte": 3,
	"color": "red"
}, {
	"gt": 3,
	"lte": 4,
	"color": "red"
}, {
	"gt": 4,
	"lte": 5,
	"color": "red"
}, {
	"gt": 5,
	"lte": 7,
	"color": "#4085e5"
}, {
	"gt": 7,
	"lte": 8,
	"color": "red"
}, {
	"gt": 8,
	"lte": 10,
	"color": "#4085e5"
}, {
	"gt": 10,
	"lte": 11,
	"color": "red"
}, {
	"gt": 11,
	"lte": 12,
	"color": "red"
}, {
	"gt": 12,
	"lte": 14,
	"color": "#4085e5"
}, {
	"gt": 14,
	"lte": 16,
	"color": "#4085e5"
}, {
	"gt": 16,
	"lte": 17,
	"color": "red"
}, {
	"gt": 17,
	"lte": 18,
	"color": "red"
}, {
	"gt": 18,
	"lte": 19,
	"color": "red"
}, {
	"gt": 19,
	"lte": 21,
	"color": "#4085e5"
}]
    },
    series: [
        {
            name:'用电量',
            type:'line',
            smooth: true,
            data: [300, 280, 250, 260, 270, 300, 550, 500, 400, 390, 380, 390, 400, 500, 600, 750, 800, 700, 600, 400],
            markArea: {
                data: [ [{
                    name: '早高峰',
                    xAxis: '07:30'
                }, {
                    xAxis: '10:00'
                }], [{
                    name: '晚高峰',
                    xAxis: '17:30'
                }, {
                    xAxis: '21:15'
                }] ]
            }
        }
    ]
};

    
截图如下