1. eden editor: Virtual Reality

2. place some platform to stand (like Land_VR_Block_02_F) at [0,-100,10] and [0-100,10], just make sure its in midair

3. execute codes and see results:

player setVehiclePosition [[0,-100,20], [], 0, "NONE"];                       //teleports to terrain surface
player setVehiclePosition [[0,-100,20], [], 0, "CAN_COLLIDE"];          //teleports to object surface
player setVehiclePosition [[0,100,20], [], 0, "NONE"];                        //object surface
player setVehiclePosition [[0,100,20], [], 0, "CAN_COLLIDE"];           //object surface

Reproducible in every map.

basically in VR map, if -10 < posValue < worldSize+30, posValue means x or y value in position will be fine, but if beyond this range, you will be teleported to ground surface instead of object surface

This might be the reason of:
When a spawn marker is placed out of map, and placed on a ship, players will spawn in the sea instead of ship surface