[Bug Report] Dropdown cannot support async sub-components
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- Dominant language
- Vue
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Description
### Element UI version
2.15.12
### OS/Browsers version
win10/chrome109
### Vue version
2.7.14
### Reproduction Link
https://codepen.io/yangdan8/pen/JjBVMqW?editors=1111
### Steps to reproduce
1. Open the page
2.View the console
"[Vue warn]: Error in mounted hook: 'TypeError: this.triggerElm.setAttribute is not a function'
### What is Expected?
/
### What is actually happening?
error
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