The TeX binary directory for Macintosh contains a symbolic link

	man -> ../../texmf-dist/doc/man

This location contains two folders "man1" and "man2".

In 2019 and 2020 and perhaps other years, the configuration software which created MacTeX added a third entry to texmf-dist/doc/man. This third entry was a symbolic link "man" which again pointed to ../../texmf-dist/doc/man. There is no such location.

Make sure this spurious link is not created in 2021. It was probably created by trying to add a new "man link" to the binary directory, but in such a way that the existing link was followed and a new link was added to its end. 

Don't do it in 2021!