Crash when use += on UWP

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();

        // OK
        // tbTest.Text = tbTest.Text + "more";

        // Crash
        tbTest.Text += "more";
    }
}

Win10 x64+ VS 2015 + Elements 8.3.90.1927

App1.zip (60.2 KB)

Thanks, logged as bugs://74569

try 8.3.90.1947. Works fine in the latest beta.

bugs://74569 got closed with status cannotrepro.