> I don't really agree that these questions test debugging skill. In real life if I read a bit of confusing code and get tricked, I will usually know immediately thanks to my IDE, compiler, automated tests, debugger, or behavior of the program. On this test if I get tricked, I just lose points.

I don't think I agree. You're talking about heuristics for debugging code and I'd argue that many of us apply similar heuristics to reading comprehension. Computer Science is not the same thing as reading comprehension, but I have to argue that if you're really good at one of these; you're probably potentially good at the other.