PersonPicture crash on release configuration

Describe the bug Crash on Release config when creating exstension class for PersonPicture

Steps to reproduce the bug

1. Create class which extends PersonPicture:

public class Avatar : PersonPicture
{
    public Avatar()
    {
    }
}

1. Add it to any place:

public MainPage()
{
    this.InitializeComponent();

    for (int x = 0; x < 10; x++)
    {
        this.Stack.Children.Add(new Avatar() { Margin = new Windows.UI.Xaml.Thickness(10), Height = 100 });
    }
}

1. Run application in debug mode and get expected result
2. Run application in release mode and get crash:

Unhandled exception at 0x063356F1 (Windows.UI.Xaml.dll) in AvatarTest.exe: 0xC000027B: an internal exception occurred in application(parameters: 0x09D79A80, 0x00000003).

Expected behavior App doesn’t crash in release mode

Video Youtube

Version Info NuGet package version: [Microsoft.UI.Xaml 2.4.3]

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
May 2020 Update (19041)	Yes
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox
Surface Hub
IoT

[Felix-Dev]

@De-Os To get your PersonPicture subclass working in Release configuration, add the BindableAttribute to it:

[Windows.UI.Xaml.Data.Bindable]
public class Avatar : PersonPicture {}

See this comment as a brief overview of the issue you are facing.

[RealTommyKlein]

@StephenLPeters - this is tricky since the Xaml compiler doesn’t have enough information to know it has to generate type information for the Avatar class (type information is generated when the type is used in markup, or has the Bindable attribute on it). It works in Debug since debug builds use the reflection provider, which doesn’t rely on compiler-generated type information.