This file is indexed.

/usr/lib/x86_64-linux-gnu/libQt5X11Extras.so.5.5 is in libqt5x11extras5 5.5.1-3build1.

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

It is a symlink to /usr/lib/x86_64-linux-gnu/libQt5X11Extras.so.5.5.1