Currently, during that transition, it is a bad idea to run an "apt full-upgrade" or try to install a new package, it will break your system!
So if you install an ISO, you have to wait before running any apt/dpkg action/tasks, you have to use it as it is and be patient!
That is what I am trying to say!
Edit: siduction is based on debian sid/unstable, have this in your mind, sometimes it is a bit rough!