ElemeFE / ElemeFE/element

[Bug Report] 动态加载并且支持多选的el-cascader,前3级是初始化时一起返回的,第四级是通过点击第3级请求接口获取的数据

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Dominant language
Vue
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Description

### Element UI version
2.15.13

### OS/Browsers version
windows

### Vue version
2.7.14

### Reproduction Link
https://codepen.io/happyyummy/pen/OJapqom

### Steps to reproduce
1、点击第三级的复选框,先是选中状态,然后请求完第四级数据之后,复选框选中状态就消失了

### What is Expected?
1、第一次点击第三级的复选框,可以加载完第四级数据之后,复选框选中状态不消失,并且全选第四级的数据

### What is actually happening?
1、第一次点击第三级的复选框,加载完第四级数据之后,复选框选中状态消失了,没有全选第四级的数据

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