Jet Upset?
These "incidents" classified as jet upsets read more like loss of control due inappropriate control inputs or inadequate monitoring of the flight. My recollection of the Dynasty 006 event is that the auto-pilot endeavoured to maintain FL410 following the run-down of an engine, to the point where level flight could not be sustained which led to the aerodynamic stall and uncontrolled descent until the aircraft was finally brought under control. Seems pretty evident that nobody was "minding the shop".