[Bug Report] Cascader, click on the option without child elements, and the child elements of the previous option are displayed on the right. #16665
Description
Element UI version
2.10.1
OS/Browsers version
win10 / Google Chrome Version 75.0.3770.142 (Official Build) (64-bit)
Vue version
2.6.10
Reproduction Link
https://codepen.io/aslantoe/pen/jgbqpG
Steps to reproduce
1、点击一个有子元素的选项。
2、再点击一个没有子元素的选项。
What is Expected?
右侧框消失
What is actually happening?
右侧框显示上一个选项的子元素
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