Popconfirm 组件在qiankun子应用中使用，升级到v4后，箭头样式异常

```js
{}}
>

```

**效果图：**

**css加载后的样式：**



请问，这种是什么原因造成的，怎么解决呀

Reproduce the reported Popconfirm usage in a qiankun child application after the v4 upgrade, comparing the arrow with and without the loaded CSS. The issue names no files or tests, so first locate the relevant component styling or migration entry point, then verify that the arrow renders correctly in the reported setup.

Written by the indexing model from the issue text.