Use "Insert" method to ObaervableCollection binded to the NavigationView.MenuItemsSource lead false result

[optimodzhu]

Describe the bug

Hello!
The control I used is NavigationView from the Microsoft.Ui.Xaml, version 2.8.2, in a Universal Windows Platform Project.
I want to insert "Item 0”， "Item 2”， "Item 3”， "Item 4”， before "Items 4", "Items 5"...
I perform Insert( 0, item ) action by clicking "Insert" Button to the ObservableCollection binded to the MenuItems property. But I got a false result. For comparason, I place a ListView on the right side of the NavigationView, whose ItemsSource property also bind to the same ObservableCollection. The result of ListView is correct. See the picutre below. The "Item 0" appears twice in the NavigationView.

The same ObservableCollection lead to different result. I think it may be some bugs in NavigationView.

Thanks very much.

Steps to reproduce the bug

I upload my project here for you to further research. Click "Insert" Button, and you will see the result.
Demo.zip

Expected behavior

No response

Screenshots

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NuGet package version

WinUI 2 - Microsoft.UI.Xaml 2.8.2

Windows version

No response

Additional context

No response