Not hindsight bias, just an asymmetrically easy verification. Imagine a large subset sum problem: answers can all be found logically, it’s very hard to find an answer, and it’s very easy to verify an answer. Any such problem can trigger hindsight bias of the form “that clearly would have been easy to solve; I just wasn’t trying”, but that’s a flaw of the biased person not the problem.
Not hindsight bias, just an asymmetrically easy verification. Imagine a large subset sum problem: answers can all be found logically, it’s very hard to find an answer, and it’s very easy to verify an answer. Any such problem can trigger hindsight bias of the form “that clearly would have been easy to solve; I just wasn’t trying”, but that’s a flaw of the biased person not the problem.