I also had this and I think it is still one of the issues that the upgrade to libsolv-0.7.17-1.fc33 caused. Fortunately everything seams to be fixed now with the newest rpm-ostree-2021.1-4.fc33 version. I upgraded the OS, layered and overrode packages after upgrading to this version.
You can try to reset the image or remove nvidia packages and then try to upgrade (witch worked for some people) but I managed to upgrade to new deployment without doing that, by installing rpm-ostree-2021.1-4.fc33.x86_64.rpm and rpm-ostree-libs-2021.1-4.fc33.x86_64.rpm manually in usroverlay and then upgrading.
These commands worked for me:
> wget https://kojipkgs.fedoraproject.org//packages/rpm-ostree/2021.1/4.fc33/x86_64/rpm-ostree-2021.1-4.fc33.x86_64.rpm
> wget https://kojipkgs.fedoraproject.org//packages/rpm-ostree/2021.1/4.fc33/x86_64/rpm-ostree-libs-2021.1-4.fc33.x86_64.rpm
> sudo rpm-ostree usroverlay
> sudo rpm -Uvh ./rpm-ostree-2021.1-4.fc33.x86_64.rpm ./rpm-ostree-libs-2021.1-4.fc33.x86_64.rpm
> sudo systemctl restart rpm-ostreed.service
> rpm-ostree upgrade
> systemctl reboot
I hope this helps.