/usr/share/doc/libharfbuzz-gobject0/changelog.Debian.gz is in libharfbuzz-gobject0 1.0.1-1build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libharfbuzz-gobject0/../libharfbuzz0b/changelog.Debian.gz