This file is indexed.

/usr/lib/x86_64-linux-gnu/libNX_X11.so is in libnx-x11-dev 2:3.5.99.16-1.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/x86_64-linux-gnu/libNX_X11.so.6.3.0