[Bug Report] el-cascader 懒加载且多选模式下，leaf 属性不生效
Open
- Dominant language
- Vue
- Stars
- 54k
- Forks
- 14.4k
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- No merged PRs in 30d
Description
### Element UI version
2.15.13
### OS/Browsers version
window 10 / chrome 114.0.5735.198
### Vue version
2.7.14
### Reproduction Link
https://codepen.io/brign/pen/KKrWGWz
### Steps to reproduce
点击选中选项4，5，6
### What is Expected?
点击 leaf 节点，不应该再去加载数据
### What is actually happening?
点击 leaf 节点，会有加载行为。
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