/usr/share/doc/libchasen-dev/changelog.Debian.gz is in libchasen-dev 2.4.5-40.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libchasen-dev/../libchasen2/changelog.Debian.gz
/usr/share/doc/libchasen-dev/../libchasen2/changelog.Debian.gz