/usr/share/doc/mit-scheme-dbg/changelog.Debian.gz is in mit-scheme-dbg 9.1.1-5build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/mit-scheme-dbg/../mit-scheme/changelog.Debian.gz
/usr/share/doc/mit-scheme-dbg/../mit-scheme/changelog.Debian.gz