At first it seemed to me that the problem was fixed at 1.82 ([[ https://feedback.bistudio.com/T127598 | first report was closed ]]), however I re-encounter it again and again.
When the tank or othe vehicle has an active current waypoint or order of AI-commander and player is commander ot this vehicle, then in menu 1/8 - the AI not will execute the "Next Waypoint" command. After pressing the 1/8, the commander (player) will tell the driver - "move to ....coordinates", but the driver will ignore this command.
This bug was added in the update 1.80