ElemeFE / ElemeFE/element

[Bug Report] dialog里的下拉框展开时在遮罩层下面

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Dominant language
Vue
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Description

### Element UI version
2.15.13

### OS/Browsers version
maxos 13.3.1 (a) (22E772610a) / 114.0.5735.198(正式版本) (x86_64)

### Vue version
2.7.14

### Reproduction Link
https://codepen.io/ziyoung/pen/LKNBqB

### Steps to reproduce
条件:1. 一个父页面,可点击打开一个对话框,对话框中有个下拉框;2. 一个子页面,可点击打开一个对话框,对话框中有下拉框。
操作步骤: 1. 从父页面点击进入子页面,打开对话框,打开下拉选项,操作后直接关闭对话框。2.不刷新回到父页面,打开对话框,打开下拉框,此时下拉框展开的内容显示在遮罩层下面(偶现)。 3.多次点击关闭/展开下拉框后可恢复正常。

### What is Expected?
下拉框可以显示在最上面而不是遮罩层下面。

### What is actually happening?
对话框中下拉框显示在遮罩层下面

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