/usr/share/man/man1/mysql-workbench-bin.1.gz is in mysql-workbench-data 6.3.8+dfsg-1build3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/mysql-workbench.1.gz
/usr/share/man/man1/mysql-workbench.1.gz