/usr/share/doc/libmlt-dbg/changelog.Debian.gz is in libmlt-dbg 6.0.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmlt-dbg/../libmlt++3/changelog.Debian.gz
/usr/share/doc/libmlt-dbg/../libmlt++3/changelog.Debian.gz