As of 89454411de97e9ab29b72c53094dc3dd2d9adfbc (0.4.0) a Ladder Dispenser can only be crafted with Rope Ladders. It should be possible with Vine and Sturdy Ladders as well as it can dispense them.
Perhaps - to demonstrate dispenser logic in the recipe - make it require 1 Sturdy Ladder in slot 8 and 1 Rope/Vine Ladder in slot 2?
As of 89454411de97e9ab29b72c53094dc3dd2d9adfbc (0.4.0) a Ladder Dispenser can only be crafted with Rope Ladders. It should be possible with Vine and Sturdy Ladders as well as it can dispense them.
Perhaps - to demonstrate dispenser logic in the recipe - make it require 1 Sturdy Ladder in slot 8 and 1 Rope/Vine Ladder in slot 2?