Reuters: Boeing Employees Had Concerns With 737 Max In 2016

Boeing concealed internal messages about the 737 Max's M casts software, linked to two fatal crashes. These messages, exchanged between employees, suggested Boeing misled the FAA during the aircraft's certification. A pilot's private messages revealed the M casts system malfunctioned during simulations. The 737 Max was grounded globally after two crashes killed over 300 people. The FAA criticized Boeing for not disclosing these messages sooner and shared the information with Congress.

When did the exchange about the M cast issue reportedly occur?

What were the consequences of the M cast feature malfunctioning in the 737 Max?