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Answering my own question in case anyone else stumbles upon this.

Changing native platform implementation from `Android.Views.View` to `AndroidX.CoordinatorLayout.Widget.CoordinatorLayout` like following fixed the issue of preview not showing.

```csharp
protected override AndroidQRCodeReaderView CreatePlatformView()
{
    var context = MauiContext?.Context ?? Platform.AppContext;
    _previewView = new PreviewView(context)
    {
        LayoutParameters = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.MatchParent)
    };
    var _relativeLayout = new RelativeLayout(context)
    {
        LayoutParameters = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MatchParent, ViewGroup.LayoutParams.MatchParent)
    };
    _relativeLayout.AddView(_previewView);
    var platformview = new AndroidQRCodeReaderView(context);
    platformview.AddView(_relativeLayout);
    return platformview;
}
```

Reference: [github/afriscic/BarcodeScanning.Native.Maui](https://github.com/afriscic/BarcodeScanning.Native.Maui/blob/master/BarcodeScanning.Native.Maui/Platform/Android/CameraManager.cs)