When the dialog Modal is used in the drop-down list DropDown component, the dialog cannot be popped up

[yjl68]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

3.0.0-beta.6

Environment

vue3 typescript

Reproduction link

Steps to reproduce

1、把对话框和按钮封装成一个组件Demo，按钮的点击事件showModal，改变变量visible，让对话框可以弹出。
2、把Demo组件放在下拉列表里面，点击后可以正常执行事件showModal，且改变了变量visible的值，但是对话框无法弹出。
3、对照步骤2，同样的Demo组件，放在其他地方，点击可以正常弹出对话框。

What is expected?

希望可以修复，因为beta.5版本是正常的，升级beta.6后失效

What is actually happening?

对话框Modal在下拉列表DropDown组件内使用时，无法弹出对话框

[github-actions]

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