For rooms that require adjacency to the ship's hull, a half valid placement, (1 hull square, 1 interior square), causes the game to give a very brief time when the user can press the left mouse button to place the room. This is the same effect observed for the placement of double armour plates. Subsequently, the hatch usually complies with attaching to the invalidily placed room.
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HalfInvalidHatchRooms.jpg [ 113.36 KiB | Viewed 4288 times ]