Apparently, the TH doctrine T2, Tank Hunter Ambush does not work. Tank Hunter Ambush allows tank buster squads to cloak in cover and hetzers can turn while cloaked in ambush mode. HOWEVER, the hetzer does not turn when in cloak ambush mode when a vehicle or tank comes within its range.
Need proof?
Click the link 1 below which leads to my replay of a game I sadly disconnected from thanks to AT&T's "great" connection quality. Observe the only one hetzer throughout the entire game stick around the middle hill in Monte Cassino and never turn while cloaked even with a tank or vehicle full within range.
Dont believe that vehicle is a hetzer?
Well click link number 2 for your proof of that!
Link 1(Replay):
http://www.filefront.com/15781013/Hetzerambushbug.rarLink 2(Hetzer Pic):
http://images4.wikia.nocookie.net/companyofheroes/en/images/thumb/7/77/Hetzer_01.jpg/370px-Hetzer_01.jpg