/usr/lib/x86_64-linux-gnu/libfcitx-config.so is in fcitx-libs-dev 1:4.2.9.6-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libfcitx-config.so.4
/usr/lib/x86_64-linux-gnu/libfcitx-config.so.4