For example?
Make a loop that sums up numbers in an array.
Write an algorithm that sorts a list of three numbers. I watched students spend an hour making a bunch of if statements to try and cover all cases... ultimately getting it wrong.
Compute the accuracy by computing the number of matches between two lists and dividing between the length.
Split a list into two lists.
Generally the failure mode is to find something vaguely near the task, but overly-sophisticated from google. Then wrestle with trying to hack it into working by frantically scouring stackoverflow etc for their next code adjustment.
A lot of frontend devs don't even work with the DOM directly after having spent years with React. Could they do it? probably. Are they prepared for DOM-related manipulation questions on a whiteboard? nope.
And suppose there are a lot of cheaters out there who don't know the things on their resume, even including earning a degree without ever having to write a working program on their own. How would you screen them out?