I tried looking at this question but it doesn't address my problem: How to change login screen sddm on KDE Plasma 5
I'm able to install new SDDM login screens (I'm using Kubuntu 20.04) using the Plasma options menu [Sytem Settings-->Startup and Shutdown-->Login Screen (SDDM)]. However, the new screen only appears when I first boot up or when I log out of my current user.
Most often I simply put the computer to sleep and then wake it back up to log in. When I do, the newly installed theme doesn't display, but instead the default screen that Kubuntu installed with. Is this expected behavior? I don't see any separate settings for "initial login" versus "login after sleep" or something similar. But clearly SDDM is treating these two situations differently.
I would like to be able to customize both screens.