Great report!!So I've tried installing both weeklies available, but regardless of which I use, it seems I have no mobile data connection at all (neither 3G nor LTE). I've tried manually entering in the APNs with no luck, but it appears that on either one of the weeklies, the device serial number does not appear. On the IMEI info page, it states the ICCID as DUMMY_NV_ICC_SERIAL, and IMEI SV as Unknown.
I've done a wipe and even formatted /system and reinstalled with the same result. Data was working fine on CM12.1.
Carrier is Boost.
You don't have a logcat do you?
