I just ran a brew upgrade which I think triggered a pyenv upgrade. The same thing happened on my private laptop this weekend.

After that on both laptops, I get this when I type python3:
/Users/alpercugun-gscheidel/.pyenv/shims/python3: line 21: /usr/local/Cellar/pyenv/1.2.20/libexec/pyenv: No such file or directory

I'm not sure why an upgrade of pyenv would break this or why this would be broken at all.