/usr/share/doc/python3-mako/changelog is in python-mako-doc 1.0.0+dfsg-0.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/python3-mako/../python-mako-doc/rst/changelog.txt
/usr/share/doc/python3-mako/../python-mako-doc/rst/changelog.txt