/usr/share/doc/libticalcs2-11-dbg/changelog.Debian.gz is in libticalcs2-11-dbg 1.1.8+dfsg2-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libticalcs2-11-dbg/../libticalcs2-11/changelog.Debian.gz