/usr/share/man/man1/tknewsbiff.1.gz is in expect 5.45-7+deb9u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man1/expect_tknewsbiff.1.gz
/usr/share/man/man1/expect_tknewsbiff.1.gz