/usr/share/doc/libzerg0-dbg/changelog.Debian.gz is in libzerg0-dbg 1.0.7-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libzerg0-dbg/../libzerg0/changelog.Debian.gz
/usr/share/doc/libzerg0-dbg/../libzerg0/changelog.Debian.gz