/usr/lib/x86_64-linux-gnu/libAppStreamQt.so is in libappstreamqt-dev 0.10.6-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libAppStreamQt.so.2
/usr/lib/x86_64-linux-gnu/libAppStreamQt.so.2