/usr/lib/x86_64-linux-gnu/libFcitxQt5WidgetsAddons.so.1 is in libfcitx-qt5-1 1.0.5-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libFcitxQt5WidgetsAddons.so.1.0
/usr/lib/x86_64-linux-gnu/libFcitxQt5WidgetsAddons.so.1.0