wood doors and trapdoors both need 6 wood but produce different amount.

Doors use a 2x3 area of planks and produce 3 doors, with an area of 2 panels making a total area of 6 panels.

trapdoors use a 3x2 area and produce 2 trapdoors, with an area of 1 panel, making a total of 2 panels.

I would expect both to produce the same area, if they use the same amount of wood and are the same thickness, so surely there should be 6 trapdoors made instead of 2.