🤔 [QUESTION] 刷选交互中，当使用x轴或y轴刷选时，重置按钮不显示

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

我在这个[官方示例](https://g2plot.antv.vision/zh/examples/dynamic-plots/brush#advanced-brush1)的 **brush 配置**中添加`type = 'x-rect'`或者`type = 'y-rect'`后进行刷选，重置按钮都不会显示，请问这是设计如此，还是一个 bug ？我并未在文档中找到相关的说明。

Start with the linked official advanced-brush1 example and its brush configuration, reproducing x-rect and y-rect selection. Check the existing brush documentation for reset-button behavior; done means the expected behavior is confirmed and the missing explanation is documented, or the issue is narrowed to an implementation bug.

Written by the indexing model from the issue text.