🐛 [BUG]桑基图移动速度快速的时候，tooltip内容错误

### 🐛 Bug description [Please make everyone to understand it]
桑基图移动速度快速的时候，tooltip内容错误
> 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
1，编写桑基图
2，鼠标移动到某个节点后，快速移动到另外一个节点
3，后一个节点显示的tooltip可能会是前一个节点的内容
### 🏞 Expected result
tooltip内容显示正确
### 🚑 Any additional [like screenshots]

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

Start with the Sankey chart tooltip handling in G2Plot and reproduce the reported steps: hover one node, then move quickly to another. Verify whether the second node shows the first node's content, and use the expected result—correct tooltip content for the currently hovered node—as the completion check.

Written by the indexing model from the issue text.