Same here, when "condition" are set at : "In Formation" (i have don't try for "in flight" or "cargo"), they will all spawn at the same place and be wounded or dead at spawn rather than appear one next other, at the position you set in the editor or like any other soldier with mortar packet in their back.
If you set "conditions" to "none" they will spawn at the exact location you set them on the map and no one will be hurt.

Fixed with Eden Editor.