Resavepackages commandlet strips level package thumbnails

FLinkerLoad::ELinkerStatus FLinkerLoad::SerializeThumbnails( bool bForceEnableInGame/*=false*/ )
{
...
				// Load the image data
				FObjectThumbnail LoadedThumbnail;
				LoadedThumbnail.Serialize(DataStream.EnterElement());

				if (!LoadedThumbnail.HasValidImageData())
				{
#if 1 // work around
                    if (IsTextFormat())
					{
    					// If we failed to load the thumbnail, stop loading as it might be unsafe
    					// to continue reading the stream.
						break;
					}
					else
					{
                        // We can continue the loop as it seeks to a safe position each time.
						continue; 
					}
#endif // end work around
                }

				// Store the data!
				ThumbnailMap.Add(CurThumbnailInfo.ObjectFullName, LoadedThumbnail);