It's a self-fulfilling prophesy, if you're using FizzBuzz to judge whether people are competent.
Programmers aren't stage performers, but companies treat interviews like auditions. Anyone with "performance anxiety" is assumed to be incompetent, which is silly. The tech interview/audition is unnatural and very different from normal work.
It's been shown by researchers over and over that interviews test for anxiety, not skills, but interviewers refuse to listen. https://news.ncsu.edu/2020/07/tech-job-interviews-anxiety/