[v5] Tooltip title 展示不正常 #4561

描述

encode('x', (d) => new Date(d.Date)) 会出现 tooltip title 重复现象，设置为 encode('x', 'Date') 则展示正常

<img width="400" alt="image" src="https://user-images.githubusercontent.com/15646325/211258530-b42d6164-5031-43ed-a77e-c4a9eef28c6c.png">

import { Chart } from '@antv/g2';

const chart = new Chart({
  container: 'container',
  autoFit: true,
  paddingLeft: 50,
});

chart.interaction({type:'tooltip'})

chart
  .line()
  .data({
    type: 'fetch',
    value: 'https://assets.antv.antgroup.com/g2/indices.json',
  })
  .transform({ type: 'normalizeY', basis: 'first', groupBy: 'color' })
  // tooltip title 正常
  // .encode('x', 'Date')
  .encode('x', (d) => new Date(d.Date))
  .encode('y', 'Close')
  .encode('color', 'Symbol')
  .scale('y', { type: 'log' })
  .axis('y', { title: '↑ Change in price (%)' })

chart.render();