Deltarune's new chapters defy every rule of RPG logic

In Chapter 4 of Deltarune, I'm playing as a pixelated character named Kris when I encounter a hallway with a locked door, a step stool, and a bright green book on a shelf. Obviously I need to move the step stool so that Kris, or another party member, can reach the book and hit the switch mechanism I think is hidden behind it. But when I go to move the stool, there's no button prompt. I cannot do anything no matter how many times I press A. So I move on...
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