What is the autopilot glitch in 737 MAX planes that Boeing has flagged?

Boeing has flagged a software glitch in certain 737 MAX planes that could cause automated vertical navigation to disengage during a missed approach. If pilots change the preprogrammed flight path, the system may switch to a simpler automation mode, requiring additional steps to re-enable it. Air India Express and Akasa Air together operate around 96 Boeing 737 MAX aircrafts.