AOT throws exception when using the custom control

[sudharsan-narayanan]

Describe the bug

Hi Team,

I have prepared the sample with the custom control by using the AOT support. In Custom sample, I have used the ComboBox ItemsSource and assigned the Observerable String to ItemsSource. So, When AOT is enable, it throws exception when it is empty or assigned any items to ItemsSource.

Please find the image below,

Attached the sample and exception below,

CustomSampleAOT.zip

Steps to reproduce the bug

1. Open the Sample.
2. Ensure the AOT is enabled in the project.
3. Now, run the sample.
4. Note: Exception is thrown in AOT sample.

Expected behavior

Sample should run smoothly without any issue.

Screenshots

No response

NuGet package version

Windows App SDK 1.6.3: 1.6.241114003

Packaging type

Packaged (MSIX)

Windows version

No response

IDE

Visual Studio 2022

Additional context

No response

[Sergio0694]

What's the returned value from InnerItemsSource if you try to read it back?