[BUG] Snackbar is not shown on second window

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Did you read the "Reporting a bug" section on Contributing file?

- [x] I have read the "Reporting a bug" section on Contributing file: https://github.com/CommunityToolkit/Maui/blob/main/CONTRIBUTING.md#reporting-a-bug

### Current Behavior

When working with a multi-window app on iOS and Android and it is required to show a snackbar on main window from second window. The snackbar keeps being shown from invoked view (second window), although an anchor from main window is provided and/or action dispatched from main window.


### Expected Behavior

A snackbar should be shown on the window where the anchor was provided

### Steps To Reproduce

1. Create a multi-window app
2. Launch the app on iOS or Android
3. Open a new window and enable split view
4. From second window tries to show a snackbar on main window

### Link to public reproduction project repository

https://github.com/vitorelli/SnackBarMultiWindow

### Environment

```markdown
- .NET MAUI CommunityToolkit: 11.2.0
- OS: Android 34, iOS 18
- .NET MAUI: 9.0.60
```

### Anything else?

If platform API is used to show the same snackbar and an anchor is provide no issue is noticed.