[bug report] cascaderpanel changes the value of V-model through dynamic data changing methods such as split, and the selected state will not change
Open
component: cascader
type: bug
- Dominant language
- Vue
- Stars
- 54k
- Forks
- 14.4k
- PR merge metrics
- No merged PRs in 30d
Description
### Element UI version
2.15.2
### OS/Browsers version
mac / chrome 91.0.4472.77
### Vue version
2.6.14
### Reproduction Link
https://codepen.io/freexu/pen/NWpBbJm?editors=1000
### Steps to reproduce
1. 点击 赋值1 ，点击 add ，v-model 数组改变但checkbox状态不变，
1.1 点击 赋值2 checkbox状态改变；
1.2 点击 change 状态不变 点击 赋值2 checkbox状态不变。
另外在点击测试的时候 ，push 有时可以生效有时则不能，表现很奇怪。
### What is Expected?
可以正常响应
### What is actually happening?
checkbox 状态异常
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