/usr/share/doc/libopenjpeg5-dbg/changelog.Debian.gz is in libopenjpeg5-dbg 1:1.5.2-3.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libopenjpeg5-dbg/../libopenjpeg5/changelog.Debian.gz