[Bug Report] cascader组件在同时开始multiple和lazy、lazyLoad的时候，在勾选中之后在请求children后，勾选中的状态会清空
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- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.15.14
### OS/Browsers version
chrome 版本 137.0.7151.104
### Vue version
2.7.16
### Reproduction Link
https://codepen.io/pen?&prefill_data_id=0a4b7681-5d42-4955-89c9-3d76f78e9cd7
### Steps to reproduce
官网的动态加载，在线运行后增加multiple，就能复现
### What is Expected?
修复该bug
### What is actually happening?
修复该bug
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