After a-directory-tree uses fieldNames, the Key value cannot be obtained when selected

[UlyssesChou]

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

Version

3.0.0-alpha.0

Environment

win10 chrome vue3.2.8

Steps to reproduce

https://codesandbox.io/s/youthful-ives-5p2kj?file=/src/App.vue:185-197

What is expected?

selectedKeys为[key]，正确的使用

What is actually happening?

selectedKeys为['']

[tangjinzhou]

@xrkffgg react 版本也有该问题

[github-actions]

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