/usr/share/doc/libmrpt-vision1.3/changelog.Debian.gz is in libmrpt-vision1.3 1:1.3.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmrpt-vision1.3/../libmrpt-base1.3/changelog.Debian.gz