flatpak: error while loading shared libraries: libgtk-4.so.0.9800.0
I installed the flatpak from gnome-nightly repository. It used to work when I installed it the first time, then didn't work anymore.
$ flatpak run org.gnome.TodoDevel
gnome-todo: error while loading shared libraries: libgtk-4.so.0.9800.0: cannot open shared object file: No such file or directory