Another thing about this is the assumption that a candidate has to be a Git ninja. If a dev can't read the Git documentation and narrow down the most important use cases, then it should definitely trigger a red flag. You don't need all the features to be productive. Unless you are an edge case, you can probably do most of what you need to get done with these six commands:

branch checkout add commit pull push

Reading and understanding the documentation for those six core commands isn't a big investment, and it will pay off if you're doing software or documentation development.