unexcept visual piecesecharts 配置项内容和展示

visual pieces 色块 有误 echarts: 4.2.1

配置项如下
      option = {
    "grid": {
        "top": 38,
        "height": 120
    },
    "toolbox": {
        "show": false
    },
    "dataZoom": [{
        "show": false
    }],
    "xAxis": {
        "type": "value",
        "min": 121.51003061728308,
        "max": 123.49267978495165,
        "splitLine": {
            "show": false
        },
        "axisLine": {
            "show": true,
            "lineStyle": {
                "color": "#999"
            }
        }
    },
    "yAxis": {
        "type": "value",
        "splitLine": {
            "show": false
        },
        "axisLine": {
            "show": true,
            "lineStyle": {
                "color": "#999"
            }
        }
    },
    "legend": {
        "show": false,
        "data": [{
            "name": "model_name=192383"
        }, {
            "name": "model_name=19292"
        }],
        "selected": {
            "model_name=192383": true,
            "model_name=19292": true
        }
    },
    "visualMap": {
        "type": "piecewise",
        "show": false,
        "dimension": 0,
        "seriesIndex": 1,
        "pieces": [{
            "color": "#839FFF",
            "gt": 122.32011333004172,
            "lt": 122.4827665391133
        }, {
            "color": "#839FFF",
            "lt": 121.67988666995828,
            "gt": 120.51003061728308
        }]
    },
    "series": [{
        "type": "line",
        "showSymbol": false,
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        "lineStyle": {
            "color": "#4971F6"
        },
        "name": "model_name=192383",
        // "areaStyle": {},
        "markLine": {
            "label": {
                "show": true,
                "position": "middle"
            },
            "symbol": ["none", "none"],
            "lineStyle": {
                "color": "#a3aebf"
            },
            "data": [{
                "xAxis": 123
            }]
        }
    }, {
        "type": "line",
        "showSymbol": false,
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}
    
截图如下