Cascader active item bug

[bq-hentai]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.1.0

Environment

Win7/vue 2.5

Reproduction link

https://tangjinzhou.gitee.io/ant-design-vue/components/cascader-cn/#components-cascader-demo-default-value

Steps to reproduce

choose the second option Jiangsu / Nanjing / Zhong Hua Men
and then expand the dropdown, check the active item.

not same as antd-react

What is expected?

same as antd-react

What is actually happening?

different

[github-actions]

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