[Problem/Bug]: WebView2CompositionControl hosted in a Winforms ElementHost crashes on load

What happened?

I'm hosting the WebView2CompositionControl in a WPF Usercontrol that itself is hosted in a Winforms ElementHost. The app is Winforms.

WebView2CompositionControl_Loaded crashes on startup with a null reference exception, I suspect it is this line...

Window.GetWindow(this).LocationChanged += WebView2CompositionControl_LocationChanged;

Since there isn't a parent WPF window when using an ElementHost. Maybe you can detect if the control is hosted like this and handle the LocationChanged in another way?

Switching to WebView2 WPF control works fine, but I'm unable to overlay controls.

Importance

Important. My app's user experience is significantly compromised.

Runtime Channel

Prerelease (Edge Canary/Dev/Beta)

Runtime Version

131.0.2903.112

SDK Version

1.0.2950-prerelease

Framework

WPF

Operating System

Windows 11

OS Version

No response

Repro steps

Create a WPF form, add an ElementHost control, and assign a WPF child control containing the WebView2CompositionControl

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

No, this never worked

Last working version (if regression)

No response