/usr/share/doc/libmx-2.0-0-dbg/changelog.Debian.gz is in libmx-2.0-0-dbg 1.99.4-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmx-2.0-0-dbg/../libmx-2.0-0/changelog.Debian.gz
/usr/share/doc/libmx-2.0-0-dbg/../libmx-2.0-0/changelog.Debian.gz