If you’re seeing apps in the Updates tab of GNOME Software in Fedora Silverblue and a Download button that does nothing; it’s a known issue and a fix has been submitted for it.
https://github.com/fedora-silverblue/issue-tracker/issues/358
https://gitlab.gnome.org/GNOME/gnome-software/-/merge_requests/1502
@aral phew. things were looking weird.