Delegates with generic error: The generic type 'System.Func`4' was used with an invalid instantiation in assembly  #826

    paddedHeight = int(System.Math.Ceiling(image.Height / 32.0) * 32.0)
    paddedWidth = int(System.Math.Ceiling(image.Width / 32.0) * 32.0)
    def processPixels(accessor):
        for y in range(paddedHeight-accessor.Height, accessor.Height):
            pixelSpan = accessor.GetRowSpan(y)
            for x in range(paddedWidth-accessor.Width, accessor.Width):
                pass
    delegate = SixLabors.ImageSharp.PixelAccessorAction[SixLabors.ImageSharp.PixelFormats.Rgb24](processPixels)