Thomas Borchert wrote:

done. Also, I'd be very interested to know more about the involvement
of autopilot operations in this one.

Good point. Climb near service ceiling, set the autopilot to hold
altitude, enter some downdraft, and when the autopilot has increased the
angle of attack to the maximum, hit some turbulence ... and there you
go. An autopilot isn't a substitute for pilot judgment.

Just speculating, as everybody.

Stefan