I know nothing, but if I swapped hands so my left was on cyclic I can imagine the following:
Lift, door pops. Swap hands. Grab door. Inadvertent movement or gust/lull and I am sinking. My reflex? Pull with left hand. Unfortunately it is now on the cyclic so I pitch aft while sinking .....
Yes I have seen the threads on similar "hands-crossed" training. And I have seen ATSB report that says PIC maybe let go of cyclic.
Like I said, I know nothing but a guy with significant experience would not simply let go of the cyclic in a Robbie in a hover. I am surprised the report did not specifically contemplate the "swapping hands" scenario if at least for a precautionary tale.