Interestingly some pilots had been experimenting with adding yaw to stalls and sharing results by word of mouth.
Flight data was extracted from SD cards that had been shared among the 3 Tecnams. Unfortunately the SD card in the accident aircraft was consumed by fire.
The most exciting outcome was a 1500' altitude loss with inversion and a maximum descent rate of 12,500 fpm
It seems this excursion was not shared. Certainly it was not formally reported. Perhaps if it had been formally reported, other pilots and operators would have become informed of the hazard.
Tecnam is not the only twin with unidentified stall excursions when yaw is present. Quite some time ago the USAF tested single engine stalls in a Baron. They needed 10,000' to recover.