[Bug] seriesIndex not work in discrete legend

[xiaoluoHe]

Version

1.3.0

Link to Minimal Reproduction

none

Steps to Reproduce

const spec = {
  type: 'common',
  padding: {
    top: 10
  },
  layout: {
    type: 'grid',
    col: 1,
    row: 6,
    elements: [
      {
        modelId: 'legend',
        col: 0,
        row: 4
      },
      {
        modelId: 'legend0',
        col: 0,
        row: 5
      },
      {
        modelId: 'DAU',
        col: 0,
        row: 0
      },
      {
        modelId: '新增',
        col: 0,
        row: 1
      },
      {
        modelId: 'MAU',
        col: 0,
        row: 2
      },
      {
        modelId: 'DAU/MAU',
        col: 0,
        row: 3
      }
    ]
  },
  region: [
    {
      id: 'DAU'
    },
    {
      id: '新增'
    },
    {
      id: 'MAU'
    },
    {
      id: 'DAU/MAU'
    }
  ],
  legends: [
    {
      visible: true,
      orient: 'bottom',
      id: 'legend',
      seriesId: ['DAUseries0', '新增series0', 'MAUseries0'],
      item: {
        visible: true,
        background: {
          style: {
            fill: 'transparent'
          }
        }
      }
    },
    {
      visible: true,
      orient: 'bottom',
      id: 'legend0',
      seriesId: ['DAU/MAUseries0'],  // only related to the last pie chart
      item: {
        visible: true,
        background: {
          style: {
            fill: 'transparent'
          }
        }
      }
    }
  ],
  series: [
    {
      id: 'DAUseries0',
      regionId: 'DAU',
      type: 'pie',
      valueField: 'value',
      categoryField: 'type',
      data: {
        id: 'DAU',
        values: [
          {
            type: '首页',
            value: 120
          },
          {
            type: '大屏',
            value: 100
          },
          {
            type: '看板',
            value: 200
          }
        ]
      },
      seriesField: 'type',
      label: {
        style: {
          visible: false
        }
      }
    },
    {
      id: '新增series0',
      regionId: '新增',
      type: 'pie',
      valueField: 'value',
      categoryField: 'type',
      data: {
        id: '新增',
        values: [
          {
            type: '首页',
            value: 80
          },
          {
            type: '大屏',
            value: 200
          },
          {
            type: '看板',
            value: 400
          }
        ]
      },
      seriesField: 'type',
      label: {
        style: {
          visible: false
        }
      }
    },
    {
      id: 'MAUseries0',
      regionId: 'MAU',
      type: 'pie',
      valueField: 'value',
      categoryField: 'type',
      data: {
        id: 'MAU',
        values: [
          {
            type: '首页',
            value: 123
          },
          {
            type: '大屏',
            value: 245
          },
          {
            type: '看板',
            value: 367
          }
        ]
      },
      seriesField: 'type',
      label: {
        style: {
          visible: false
        }
      }
    },
    {
      id: 'DAU/MAUseries0',
      regionId: 'DAU/MAU',
      type: 'pie',
      valueField: 'value',
      categoryField: 'type',
      data: {
        id: 'DAU/MAU',
        values: [
          {
            type: '首页1',
            value: 10
          },
          {
            type: '大屏1',
            value: 18
          },
          {
            type: '看板1',
            value: 8
          }
        ]
      },
      seriesField: 'type',
      label: {
        style: {
          visible: false
        }
      }
    }
  ]
};

const vchart = new VChart(spec, { dom: CONTAINER_ID });
vchart.renderAsync();

// Just for the convenience of console debugging, DO NOT COPY!
window['vchart'] = vchart;

Current Behavior

Expected Behavior

Environment

- OS:
- Browser:
- Framework:

Any additional comments?

No response