SDDM loses user carousel on Fedora

Just seeing if anyone else has come across this issue. I have a couple of laptops with Fedora 33 installed using KDE and SDDM as the greeter. One that is having the issue, I just rebuilt a day ago. The user chooser carousel is missing on one and I have no idea how to get it back. I can log in but have to type my name, which is just fine, but would prefer to have the chooser. I've uninstalled, deleted all the config files and reinstalled. I've copied working configs from a working machine (which are identical, anyway) and just can't get it going.

I don't see any SELinux errors. There are QT errors logged, but I see the same thing on both working and non-working machines.