MenuItem title stop working when it has children.

[Lukiya]

Reproduction link

Steps to reproduce

Create a MenuItem array, assign title property to all top level items, then some add children, some doesn't add children.

What is expected?

Menu item title should show a string when mouse hover.

What is actually happening?

It only shows when there's no children

Environment	Info
antd	5.16.5
React	4.4.4
System	Win11
Browser	Edge & Chrome

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https://codesandbox.io/p/sandbox/menu-item-title-6glrvk?file=%2Fsrc%2FApp.tsx

Above example will show details.

[coderz-w]

我来看看😊

[coderz-w]

Combining the document for review, it appears that this feature has not yet been implemented. When a "child" exists, what is actually rendered is not a "MenuItem" but a "SubMenu", and the "SubMenu" does not have a "title" attribute.

[Lukiya]

Title is very important for collapsed menu items.

[coderz-w]

@li-jia-nan 哥，这个需要做不

[li-jia-nan]

@li-jia-nan 哥，这个需要做不

感觉可以做，但是我拿不准，问问大佬 @zombieJ @MadCcc