/usr/share/doc/libtagc0-dev/changelog.Debian.gz is in libtagc0-dev 1.11.1+dfsg.1-0.2build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libtagc0-dev/../libtag1v5-vanilla/changelog.Debian.gz