I don't see the problem with a corner cutter question located around the end of a test.

It filters people into:

- those who don't manage time efficiently by investing too much energy on a problem.

- those who did cut the corner and as a result got an edge with a few more questions solved

- the genius ones, who solved everything, in whatever order

If the objective of a test is classifying candidates and time management is one of the metric considered, then this kind of testing pattern absolutely makes sense.

I was one of those who never cut corners and just focused on the problem at hand until failure, and now that I am working and need to get things done I wished my teachers trained me that skill.