GUI isn't updating mM8 screen, just a duplicate behind the window

[Trilkhai]

I'm running the latest version of MicroM8 GUI (as of May 6th 2020) along with the version of MicroM8 it comes with. I'm in 64-bit OpenSUSE Linux, running KDE 5/Plasma.

I noticed upon opening the GUI that the usual "microM8" opening screen wasn't animating/rotating as usual; I told it to launch a game, but even though I could hear it, the GUI window still just showed the static MicroM8 screen. At that point I clicked away to look the issue up in my browser, and when I clicked back to the MM8 GUI window, it updated the Apple II screen to the most recent static state.

A little more experimenting showed that the mM8-GUI is making all of the live changes/updates to a copy of the Apple II screen behind the GUI window (see screenshots), then closing the copy and displaying its most recent state in the GUI when I click away from it. If I drag the mM8-GUI window, the updated duplicate is left behind until I release the mouse button; at that point the copy again vanishes/closes and instead its updated state appears in the GUI's version:

Oddly enough, now every time I open microM8 GUI, the static mM8 screen is shown and the live/animated rotating one is also shown staggered behind it:

All versions of microM8 work fine if launched on their own, including the one included with microM8-GUI. Launching the mM8-GUI from Konsole didn't show any errors or warnings that would explain the strange behavior.