[Bug] visualMap 只配置两个项无法正确渲染图表
Open
bug
pending
- Dominant language
- TypeScript
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- Avg merge
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Description
### Version
6.0.0
### Link to Minimal Reproduction
https://echarts.apache.org/examples/zh/editor.html?c=line-sections
### Steps to Reproduce
1. 官方文档的例子，修改visualMap配置项如截图
2. 点击运行
### Current Behavior
### Expected Behavior
正常渲染图表
### Environment
```markdown
- OS: windows 10
- Browser: chrome
- Framework: react@18
```
### Any additional comments?
_No response_
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