/usr/share/doc/libpugixml1-dbg/changelog.Debian.gz is in libpugixml1-dbg 1.2-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libpugixml1-dbg/../libpugixml1/changelog.Debian.gz
/usr/share/doc/libpugixml1-dbg/../libpugixml1/changelog.Debian.gz