Loading images using .net file streams does not work when AOT is enabled

[lhak]

Describe the bug

Calling BitmapImage.SetSourceAsync() with a .net file stream using stream.AsRandomAccessStream() leads to WinRT originate error - 0x80004002 : 'Specified cast is not valid.'

To Reproduce

Code similar to the one below:

using (FileStream stream = File.OpenRead(path))
{
  bitmapImage = new BitmapImage();
  await bitmapImage.SetSourceAsync(stream.AsRandomAccessStream());
}

works correctly when AOT is disabled but not when it is enabled

Expected behavior

.net file streams should work when AOT is enabled

Version Info

appsdk 1.6 experimental 1, CsWinRT 2.1.0-prerelease.240602.1

Additional context