You mean in the testing build the testers have that probably fixed the following issue : Hydraulics while flying the ATR 42/72-600 ?
More seriously, if you fixed the other issue in the current testing build, chance are that this intermittent issue is also fixed
one thing I remember in pre SU13 is how NP would vary a little depending on the wind and the direction the aircraft is taxiing, which means that under more extreme winds chance are that NP could go low enough for AC wild generators go offline.
If they fixed the other issue by either putting a minimum NP when condition levers are at Auto or upping the torque slightly at ground idle, it could also fix this intermittent issue