Binding TokenizingTextBox ItemSource to a nested model throws InvalidCastException

[HSKC]

Describe the bug

Binding the TokenizingTextBox ItemSource to an ObservableCollection inside a nested object eg. {x:Bind ViewModel.MyObject.Tags, Mode=TwoWay} results in InvalidCastException: Unable to cast object of type 'CommunityToolKit.WinUi.Controls.InterspersedObservableCollection' to type 'System.Collections.ObjectModel.ObservalbeCollection[System.String]'

Steps to reproduce

page.xaml
...
<controls:TokenizingTextBox ItemSource="{x:Bind ViewModel.Object.Tags, Mode=TwoWay}" />
...

page.xaml.cs
...
public MyViewModel ViewModel {get;}
...

MyViewModel.cs
...
public MyObject Object {get; set;} = new();
...

MyObject.cs
...
public ObservableCollection<string> Tags {get; set;} = new();
...

Expected behavior

No exception should be thrown

Screenshots

No response

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

No response

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

22621

Visual Studio Version

No response

Visual Studio Build Number

No response

Device form factor

No response

Additional context

No response

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