Backdrop Missing when resizing canvas

I am using a CanvasAnimatedControl that fills my window. When I resize the app, the backdrop disappears. Additionally, sometimes when I start the app, the backdrop doesn’t appear, but after restarting the app a few times, it shows up again.

<img width="1440" height="727" alt="Image" src="https://github.com/user-attachments/assets/fd60c408-c5d0-4972-94a9-a846296cb1aa" />