Plenty of drivel and focus upon a single cause none of which is based upon any ascertainable fact(s).
However there is a gem of insight that serves to set the wagon back upright upon its wheels.
Yaw to the left with loss of drive to the tail rotor in the 206?
Thanks to Gullibell for offering his excellent insight, knowledge , and attention to detail which should serve as an attention getter to so many here.
The rest of you need to get back into the books and RFM for the aircraft you are flying (American versions and not the French or Russian versions).