[Bug] legend filter result is incorrect when configured legend data spec

[purpose233]

Version

1.13.2

Link to Minimal Reproduction

null

Steps to Reproduce

const spec = {
  type: 'bar',
  data: [
    {
      id: 'barData',
      values: [
        {
          State: 'WY',
          Age: 'Under 5 Years',
          Population: 25635
        },
        {
          State: 'WY',
          Age: '5 to 13 Years',
          Population: 1890
        },
        {
          State: 'WY',
          Age: '14 to 17 Years',
          Population: 9314
        },
        {
          State: 'DC',
          Age: 'Under 5 Years',
          Population: 30352
        },
        {
          State: 'DC',
          Age: '5 to 13 Years',
          Population: 20439
        },
        {
          State: 'DC',
          Age: '14 to 17 Years',
          Population: 10225
        },
        {
          State: 'VT',
          Age: 'Under 5 Years',
          Population: 38253
        },
        {
          State: 'VT',
          Age: '5 to 13 Years',
          Population: 42538
        },
        {
          State: 'VT',
          Age: '14 to 17 Years',
          Population: 15757
        },
        {
          State: 'ND',
          Age: 'Under 5 Years',
          Population: 51896
        },
        {
          State: 'ND',
          Age: '5 to 13 Years',
          Population: 67358
        },
        {
          State: 'ND',
          Age: '14 to 17 Years',
          Population: 18794
        },
        {
          State: 'AK',
          Age: 'Under 5 Years',
          Population: 72083
        },
        {
          State: 'AK',
          Age: '5 to 13 Years',
          Population: 85640
        },
        {
          State: 'AK',
          Age: '14 to 17 Years',
          Population: 22153
        }
      ]
    }
  ],
  xField: 'State',
  yField: 'Population',
  seriesField: 'Age',
  stack: true,
  legends: {
    visible: true,
    data: (items) => {
      console.log(items);
      return items.map((item, index) => ({ ...item, label: index }));
    }
  },
  bar: {
    // The state style of bar
    state: {
      hover: {
        stroke: '#000',
        lineWidth: 1
      }
    }
  }
};

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

// 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

[xile611]

@purpose233 这种用法修改了图例数据，交互后没有可用数据
如果只是想做图例项的格式化，应该通过 item.label.formatMethod 实现

https://visactor.com/vchart/option/barChart-legends-discrete#item.label.formatMethod