[Bug]: 触发单个元素的高亮时,高亮未生效

### Describe the bug / 问题描述

官网的柱状图实例,开启高亮交互,然后添加如下触发的逻辑,高亮没有生效,
如果同时高亮多个元素是正常的
```
setTimeout(()=>{
chart.emit('brush:highlight',{data:{selection:[['H'],[0,2000]]}})
},1000)
```

### Reproduction link / 复现链接

_No response_

### Steps to Reproduce the Bug or Issue / 重现步骤

官网的柱状图增加一个触发事件就可复现

### Version / 版本

🆕 5.x

### OS / 操作系统

- [ ] macOS
- [x] Windows
- [ ] Linux
- [ ] Others / 其他

### Browser / 浏览器

- [x] Chrome
- [ ] Edge
- [ ] Firefox
- [ ] Safari (Limited support / 有限支持)
- [ ] IE (Nonsupport / 不支持)
- [ ] Others / 其他

Start with the official bar-chart example described in the issue and trace the chart.emit('brush:highlight', {data:{selection:[['H'],[0,2000]]}}) entry point. Compare highlighting one element with highlighting multiple elements, then verify that the single-element case highlights as expected.

Written by the indexing model from the issue text.