I updated to the April 7th nightly build after playing Real Racing 3 for a while. I have a scheduled backup of all my app data on Sundays through Titanium Backup Pro but for some reason, Real Racing 3 didn't get backed up. Flashing this nightly build only requires me to flash the update then wipe system cache/dalvik cache then reboot. I didn't lose any data for any other app but this one. RR3 subsequently had to re-download all the 6gb's of the app and after logging in to my account, I got none of the data back.
It's not like I wiped my data, why can't it find my RR3 save files?