"ostree(akmod-nvidia.post)[10990]: Building
/usr/src/akmods/nvidia-kmod-440.64-2.fc33.src.rpm for kernel
5.6.0-0.rc7.git1.1.fc33.x86_64"
You're using fc33 kernels which are Rawhide. You'll need to rebase down to F32 or
F31.
rpm-ostree rebase fedora/32/x86_64/silverblue