As best I can tell the info is there but doesn't show up as the last frame in a file when you put it into editing software. Easy enough to stitch two files together and go frame by frame. I think it works fine.
There's a free windows program called fjoiner that can stitch the files together so the missing frame reappears. I have no idea why you can't just dump all the files into an editing program and it drove me nuts for a while until I found the solution.