ListViewExtensions.AlternateColor doesn't work with ListView.Items with ListViewItem

[Arlodotexe]

Describe the bug

ListViewExtensions.AlternateColor doesn't work when the ListView declares Items with an item type of ListViewItem.

In our sample gallery under ./components/Extensions/samples/ListViewExtensionsAlternateColorSample.xaml, we use x:String with Items:

<ListView ui:ListViewExtensions.AlternateColor="Silver">
    <ListView.Items>
        <x:String>One</x:String>
        <x:String>Two</x:String>
        <x:String>Three</x:String>
        <x:String>Four</x:String>
        <x:String>Five</x:String>
        <x:String>Six</x:String>
        <x:String>Seven</x:String>
        <x:String>Eight</x:String>
        <x:String>Nine</x:String>
        <x:String>Ten</x:String>
    </ListView.Items>
</ListView>

This works as expected, but if you swap out x:String for ListViewItem then the AlternateColor extension stops working:

<ListView ui:ListViewExtensions.AlternateColor="Silver">
    <ListView.Items>
        <ListViewItem Content="One" />
        <ListViewItem Content="Two" />
        <ListViewItem Content="Three" />
        <ListViewItem Content="Four" />
        <ListViewItem Content="Five" />
        <ListViewItem Content="Six" />
        <ListViewItem Content="Seven" />
        <ListViewItem Content="Eight" />
        <ListViewItem Content="Nine" />
        <ListViewItem Content="Ten" />
    </ListView.Items>
</ListView>

Full repro can be found here:
ListViewExtensionsAlternateColorItemsBug.zip

Steps to reproduce

See above.

Expected behavior

Using ListViewItem should work just the same as using x:String with no difference in alternate color behavior.

Screenshots

Code Platform

• UWP
• WinAppSDK / WinUI 3
• Web Assembly (WASM)
• Android
• iOS
• MacOS
• Linux / GTK

Windows Build Number

• Windows 10 1809 (Build 17763)
• Windows 10 1903 (Build 18362)
• Windows 10 1909 (Build 18363)
• Windows 10 2004 (Build 19041)
• Windows 10 20H2 (Build 19042)
• Windows 10 21H1 (Build 19043)
• Windows 10 21H2 (Build 19044)
• Windows 10 22H2 (Build 19045)
• Windows 11 21H2 (Build 22000)
• Other (specify)

Other Windows Build number

Windows 11 24H2, Build 26100

App minimum and target SDK version

• Windows 10, version 1809 (Build 17763)
• Windows 10, version 1903 (Build 18362)
• Windows 10, version 1909 (Build 18363)
• Windows 10, version 2004 (Build 19041)
• Windows 10, version 2104 (Build 20348)
• Windows 11, version 22H2 (Build 22000)
• Other (specify)

Other SDK version

No response

Visual Studio Version

No response

Visual Studio Build Number

No response

Device form factor

No response

Additional context

Originally reported by @0x5bfa in the #community-toolkit channel of the Windows App Community discord server.

Help us help you

Yes, I'd like to be assigned to work on this item.