Because http://flatpak.org/apps.html is entirely wrong. Do an s/tree/plain/. Correct: https://git.gnome.org/browse/gnome-apps-nightly/plain/gnome-builder.flatpakref Not correct: https://git.gnome.org/browse/gnome-apps-nightly/tree/gedit.flatpakref Make GNOME great again. Use right link. Not fake link.