/usr/share/man/cs/man7/utf8.7.gz is in manpages-cs 0.18.20090209-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/cs/man7/utf-8.7.gz
/usr/share/man/cs/man7/utf-8.7.gz