Shadows not drawing/updating correctly in Windows & cover entire screen (okay in Android/iOS)

[jonmdev]

Description

Windows has had some abnormal Shadow behavior which continues into the most recent .NET 8 version 8.0.0-rc.2.23479.6.

I posted a prior example but that code no longer repros in this version so I updated the code (prior here: #17996).

This bug is making Shadows unusable in Windows. Shadows cover the entire screen in certain circumstances in Windows.

CORRECT BEHAVIOR
Here is what the current project should look like as shown in Android:

ABNORMAL BEHAVIOR
Here is what it looks like in Windows:

Steps to Reproduce

Play repro project in Windows vs. Android. See in Windows the Shadow abnormally covers the entire screen.

All custom repro project code is in App.xaml.cs (109 lines total in this document to repro). Otherwise, the project is a default Maui project.

Link to public reproduction project repository

https://github.com/jonmdev/Windows-Shadow-Mask-Bug

Version with bug

7.0.96
8.0.0-rc.2.23479.6

Is this a regression from previous behavior?

No, this is something new

Last version that worked well

None. Present in .NET 7 & .NET 8.

Affected platforms

Windows

[ghost]

We've added this issue to our backlog, and we will work to address it as time and resources allow. If you have any additional information or questions about this issue, please leave a comment. For additional info about issue management, please read our Triage Process.