✅ FileStream is not reading entire file?

var path = Core.FindDataFile("client.exe", false);

using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
            {
                var buffer = new byte[fs.Length];
                fs.Read(buffer, 0, buffer.Length);

                // VS_VERSION_INFO (unicode)
                Span<byte> vsVersionInfo = stackalloc byte[]
                {
                    0x56, 0x00, 0x53, 0x00, 0x5F, 0x00, 0x56, 0x00,
                    0x45, 0x00, 0x52, 0x00, 0x53, 0x00, 0x49, 0x00,
                    0x4F, 0x00, 0x4E, 0x00, 0x5F, 0x00, 0x49, 0x00,
                    0x4E, 0x00, 0x46, 0x00, 0x4F, 0x00
                };

                for (var i = 0; i < buffer.Length - 30; i++)
                {
                    if (vsVersionInfo.SequenceEqual(buffer.AsSpan(i, 30)))
                    {
                        var offset = i + 30 + 12;

                        var minorPart = BinaryPrimitives.ReadUInt16LittleEndian(buffer.AsSpan(offset));
                        var majorPart = BinaryPrimitives.ReadUInt16LittleEndian(buffer.AsSpan(offset + 2));
                        var privatePart = BinaryPrimitives.ReadUInt16LittleEndian(buffer.AsSpan(offset + 4));
                        var buildPart = BinaryPrimitives.ReadUInt16LittleEndian(buffer.AsSpan(offset + 6));

                        return new ClientVersion(majorPart, minorPart, buildPart, privatePart);
                    }
                }
            }