dropdown menu divider class does not correctly, show class name like undefined-item-divider

[atom-git]

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

Version

2.2.0-beta.2

Environment

MAC chrome91 ant design vue 2.2.0-beta.2

Reproduction link

Steps to reproduce

dropdown menu divider does not show

What is expected?

dropdown menu divider has the right class name ant-design-item-divider

What is actually happening?

dropdown menu divider class name like undefined-item-divider

[github-actions]

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