Out of interest, before the grounding were there any recorded instances of a more benign air data failure on a MAX, obviously without producing the JT/ET result
I believe that the database showed several pilot reported incidents...without the knowledge of MCAS and confusion on the aircraft nomenclature (737-800 vs 737-8, etc) the reports are a bit generic.
https://www.politico.com/story/2019/...ng-737-1266090
https://edition.cnn.com/2019/03/13/u...max/index.html
there is also this FAA AD:
"This proposed AD was prompted by reports of nuisance stick shaker activation while the airplane accelerated to cruise speed at the top of climb. This proposed AD was also prompted by an investigation of those reports that revealed that the angle of attack (AOA) (also known as angle of airflow) sensor vanes could not prevent the build-up of ice, causing the AOA sensor vanes to become immobilized, which resulted in nuisance stick shaker activation. This proposed AD would require a general visual inspection of the AOA sensors for a part number, and replacement of affected AOA sensors. We are proposing this AD to address the unsafe condition on these products.
The AD will apply to certain Boeing aircraft, including the 727,
757, 767-300, -300F and 400ER series."
https://simpleflying.com/faa-boeing-aoa-sensor/