Impossible to install updates with GNOME Software 43~alpha
Since 43~alpha landed in Fedora Rawhide recently, it seems to be impossible to install updates. If I go to the Updates pane with updates available and click Download, the button turns into a "Cancel" button and a small progress bar at the bottom of it fills up; this is normal. When it has filled up, the button turns back into a Download button - that's not normal, it should become a "Restart & Update" button. A few seconds later the pane is automatically refreshed for some reason, but the button stays as a "Download" button. Clicking it again repeats the same cycle. I have not found any way to make it actually reach the "Restart & Update" state which allows installing the updates.
There appear to be no relevant messages in the system logs, or at the console when running gnome-software from one. So I'm not sure what's going wrong, but it's clearly broken, and easy to reproduce.