Autologin to wrong session type

Somehow my autologin has seized to respect my previous choice for session type. My Tumbleweed autologins me into KDE. I logout, manually choose GNOME and use the computer happily. Next time: I'm back to KDE again. I even tried logging in with Gnome chose, logging out, logging in *again* (this time it defaulted to Gnome as expected), and then rebooting. And back to KDE I was. Meh.

Currently using SDDM as the DM.

Any idea of how I could tell my otherwise friendly leetle computer that I would please prefer it booting into Gnome?