I would post in the forums for that particular ROM, the users will know best about that situation. Unfortunately when it comes to Android and flashing ROMs it can be incredibly difficult to pinpoint the issue due to the variance in devices.
Thanks for sharing I hope Someone out there can chip in too, it's the only issue between me & kitkat, I've had to revert to CM JB 4.3 just coz of the faulty sim tool kit in 4.4. My device is Samsung GT-I9300 using the Safaricom network in Kenya.
I suggest you post this on XDA-Developers.