skipping exif id code before extending the exif profile

src/ImageSharp/Formats/Jpeg/PdfJsPort/PdfJsJpegDecoderCore.cs

@@ -489,7 +489,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.PdfJsPort
                 else
                 {
                     // if the exif information exceeds 64K, it will be split over multiple APP1 marker
-                    this.MetaData.ExifProfile.Extend(profile);
+                    this.MetaData.ExifProfile.Extend(profile.Skip(6).ToArray());
                 }
             }
         }

src/ImageSharp/MetaData/Profiles/Exif/ExifProfile.cs

@@ -237,9 +237,8 @@ namespace SixLabors.ImageSharp.MetaData.Profiles.Exif
         {
             int currentLength = this.data.Length;
 
-            // the first 6 bytes are Exif00 and will be skipped
-            Array.Resize(ref this.data, currentLength + bytes.Length - 6);
-            Buffer.BlockCopy(bytes, 6, this.data, currentLength, bytes.Length - 6);
+            Array.Resize(ref this.data, currentLength + bytes.Length);
+            Buffer.BlockCopy(bytes, 0, this.data, currentLength, bytes.Length);
         }
 
         /// <summary>