What's wrong with quantum mechanics? Same thing. If the problem isn't exactly the same then the outputs will actually differ in"edge" cases. And the problem is when trying to induce the problem we don't at first know to what degree of exactness we can make confirmations. So we either need to (a) take a long time to learn or otherwise know exactly what the problem is or (b) have the degree of wisdom (eyesight) to already be able to confirm that the problem-function will have no unexpected outputs at a glance by checking key features despite the wise person not having directly sampled/computed all possible outputs.