/usr/share/doc/tk8.6/changelog.Debian.gz is in tk8.6 8.6.5-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/tk8.6/../libtk8.6/changelog.Debian.gz
/usr/share/doc/tk8.6/../libtk8.6/changelog.Debian.gz