Spawning a unit on the pier in Marina Bay causes that unit to spawn on the ground (or water) underneath and not on top of the pier object, causing the unit to be either partially or wholly inside it.
There seems to be no way to get out short of killing yourself.
Spawn a player unit on the pier and press Preview. Your player will be inside the object rather than spawn on top of it.
I believe this issue stems from the elevation of spawn being determined from the surface of the water rather than the pier itself. If units are spawned at an elevation of 2 m in the unit spawn dialogue they correctly settle on the the top of the pier.
Agreed with malk but still the editor should be able to "realize" the object/ground height where you are spawning units.
@OP
Use the setPos to select the correct spawn height as a temp fix
Use elevation setting when placing a unit (bottom left corner, it's in meters. It's ok to place a unit just a little above the surface and have then fall down onto it.
We are very sorry, this issue was closed as duplicate.
You can monitor this issue's progress here #249