Have you tried flashing from Android 62.0.A.3.109 to SFOS 4.4.0.64?
The first two times I flashed SFOS 4.4.0.64 I was on Android 62.0.A.9.11. Both times the IPv4 mobile data connection under SFOS did not work.
Only when I flashed to Android 62.0.A.3.109 and then to SFOS 4.4.0.64 did the IPv4 mobile data connection work.
After today’s update to 4.4.0.68, the IPv4 mobile data connection no longer works.
Maybe just a coincidence, but I’ll test it again tomorrow with SFOS 4.4.0.64.