🐛 [BUG]饼图名称相同 , 不会显示label ,v1版本好像没有这个问题

### 🐛 Bug description [Please make everyone to understand it]

> Please provide a link by forking these links [G2Plot](https://codesandbox.io/s/g2plot-issue-template-gzfdq?file=/index.ts) or GitHub repo, a minimal reproduction.

* _Required_ **Link to minimal reproduction**:

### 📷 Step to reproduce

### 🏞 Expected result

### 🚑 Any additional [like screenshots]

* **G2Plot Version**:
* **Platform**:


Start with the G2Plot issue template linked in the report and inspect its /index.ts entry point. Reproduce a pie chart whose names are identical, then compare the result with the stated v1 behavior; done means the expected labels are displayed, with a minimal reproduction and version details recorded.

Written by the indexing model from the issue text.