Error thrown out in Menu widget when use Random function in key binding

[tnmoon]

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

Version

3.3.0-beta.2

Environment

macOS, Chrome 106.0.5249.119, Vue3

Reproduction link

Steps to reproduce

1. click 菜单1;
2. click 菜单2;
3. Cannot read properties of undefined (reading 'childrenEventKeys') thrown out;

What is expected?

avoid to throw error when use Random function in key binding;

What is actually happening?

err thrown out when use Random function in key binding;

[tangjinzhou]

这个 key 加的没有任何意义啊

[github-actions]

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