Wasn't there a recent study that found that the main things modern interviews test for is lack of anxiety?

And when you're told that your career rests on how perfectly you do in this interview and that any deviations from perfection will make you fail, is it any wonder people get anxious?

I once almost failed the most common leetcode easy problem because my mind blanked and I implemented the wrong solution at first. Interviewer probably labeled me as someone with fake credentials as I didn't have time for their second problem as a result.

I've worked with enough people in both groups to have little difficulty believing either. More than once I've had an engineer on my team that we worked with by confining their work to somewhere where they couldn't do much damage.