I want to convert tiff image using LibTiff.Net, I already did that but having an black line on top of every bitmap, so am I missing something here?

private static Bitmap GetBitmapForTiffImage(
            IStreamSource streamSource,
            Rect sourceRectangle)
        {
            // Create a TIFF image from the stream source.
            using var tiffImage = CreateTiffImageFromStream(streamSource);

            if (tiffImage == null)
                return null;

            // Extract coordinates and dimensions of the source rectangle.
            var sourceX = sourceRectangle.Left;
            var sourceY = sourceRectangle.Top;
            var sourceWidth = sourceRectangle.Width();
            var sourceHeight = sourceRectangle.Height();

            // Create Android Bitmap with specified dimensions and configuration.
            var config = Bitmap.Config.Argb8888;
            if (config == null)
                return null;

            var bitmap = Bitmap.CreateBitmap(sourceWidth, sourceHeight, config);

            // Now Reading TIFF image into Bitmap.
            // Buffer to hold scanline data from the TIFF image.
            var scanline = new byte[tiffImage.ScanlineSize()];

            // Iterate through each row of the source rectangle.
            var destY = 0;
            for (var y = sourceY; y < sourceY + sourceHeight; y++)
            {
                // Read the scanline data from the TIFF image.
                tiffImage.ReadScanline(scanline, y);
                var destX = 0;

                // Iterate through each pixel in the current row.
                for (var x = sourceX; x < sourceX + sourceWidth; x++)
                {
                    // Assuming 3 bytes per pixel (RGB).
                    var index = x * 3;

                    // Extract RGB components from the scanline buffer and create a color.
                    var pixelColor = Color.Argb(255, scanline[index], scanline[index + 1], scanline[index + 2]);

                    // Set the pixel color in the Bitmap at the current coordinates.
                    bitmap.SetPixel(destX, destY, pixelColor);
                    destX++;
                }

                destY++;
            }

            return bitmap;
        }

I already tried changing coordinates and play with loop. Rect values are perfect.
How can I handle that black line that’s irritating.