Precision Land not working in AUTO Mode


I am sending landing_target mavlink messages from companion computer.

The precision Landing is working fine with the LAND mode

currently the PLND_TYPE is 1
also PLND_ENABLED is 1

But if i try the same with AUTO mission with the last waypoint as MAV_CMD_NAV_LAND then the precision land is not working

few months before i tried AUTO missions precision landing with pixy ir lock sensor directly connected to Pixhawk… it worked well…

pls help