Setpoint jumped to origin in LAND

Today we had some severe problem. We are using ‘CUAV Pixhawk V6X V2’ flight controller. We had the our drone tested for the past week and had no issue but today when switched to LAND mode, it suddenly came down crashing at around 3-4 meters of altitude.

In the logs we can see that the setpoint suddenly becomes origin. Not sure what caused this and if this is a bug. I’m putting a link to Flight Log below

Flight Log