Confirmed. If I leave those last 2 alone it works for me.
I lost data a few times after that so I just went ahead and swapped the apn.config file with one from stock Rom.
Humble suggestion....use the apn configuration from cm12 and add it to your Rom. It pretty much covers almost all carriers.
I am on ATT Network using N910t phone - for what it's worth, I did not have to setup APN - it was setup already - correctly on the ATT Network.