饼图模式下 color 配置成值对应的字段，生成的图例是连续性图例，这个时候如果配置了label，只显示最后一个 #3160

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Reproduction link

Steps to reproduce

const data = [
  { item: "事例一", count: 40, percent: 0.4 },
  { item: "事例二", count: 21, percent: 0.21 },
  { item: "事例三", count: 17, percent: 0.17 },
  { item: "事例四", count: 13, percent: 0.13 },
  { item: "事例五", count: 9, percent: 0.09 }
];

chart
  .interval()
  .adjust("stack")
  .position("percent")
  .color("count")
  .label("percent", (percent) => {
    return {
      content: (data) => {
        return `${data.item}: ${percent * 100}%`;
      }
    };
  })

将 color从item 改成 item 这个时候是连续性图例，展示也正常，当时 label 配置不正确了

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