Large portrait images break in FB presenter mode (but fine otherwise)

[ispiro]

https://www.facebook.com/photo.php?fbid=10100516302427593&set=a.10100516285860793.2462807.203840&type=3&theater

In presenter mode, the baccant header string comes back as "baccibnt." But it works fine upon refresh in regular image mode. In both cases, it appears to be decoding the exact same JPEG file.