Mode confusion is intrinsic in highly automated systems. It is incumbent on the system to clearly communicate why the mode has changed and the implications.
Dropping the AP and a console alarm announcing "Unreliable airspeed" won't do, particularly with pilots who do very little hand/raw data flying.
"Hi guys! Sorry to disturb you but my pitot tubes are not giving me a reliable airspeed. I have disconnected the autopilot and we are now in alternate law"
"I suggest that you turn off the FD and just fly pitch and power while see if I can get our airspeed indications back."
Result (probably), no panic stickback, no stall and no accident.
Mac (the other Mac, not a pilot but has programmed an automated system)
[Never mind the non-coupled sidesticks, the autotrim and all the rest of it]