This issue is known. Installation fails on flatpaks installation.
Guess, the problem depends the runtime that silverblue flatpak apps need.
My Fedora Silverblue Rawhide try installs runtime/org.fedoraproject.Platform/x86_64/f30runtime/org.fedoraproject.Platform/x86_64/f32.
Maybe flatpak apps that to be installed need already f33 runtime?