When asking anaconda to upgrade an existing system instead of install, I get the attached exception.
Created attachment 201951 [details] dump from anaconda
Doesn't happen in today's rawhide. Since this was reproducible without actually letting the installer _do_ anything, I'll keep an eye out for it happening again.
Closing for now as we haven't been able to reproduce it. Feel free to reopen this bug report if you run into the problem again.