🐛 [BUG] Area面积图，基础面积图，多数类型数据时，折线在区域中的位置显示略有问题~

### 🐛 Bug description [Please make everyone to understand it]
Area面积图，基础面积图，多数类型数据时，折线在区域中的位置显示略有问题~
一图胜千言~

**codesandbox**: https://codesandbox.io/s/shy-feather-7nho0?file=/index.ts

Start by running the linked CodeSandbox and inspect its index.ts example for the basic area chart with multiple data types. Compare the rendered line position with the attached image and trace the chart configuration or rendering path involved. Done means the line is positioned correctly within the filled area for the reproduced case.

Written by the indexing model from the issue text.