I'm not sure if you worry about issues from Dev Channel releases of Windows 10. I'm currently on OS Build 21327.1000, using Curtains v1.17, and I'm seeing some funky distortions that seem to pop up intermittently when a window receives focus.
If I have an instance of File Explorer open, for example, and an instance of the Curtains app, I can get this to happen by clicking between Explorer, the Windows Desktop, and Curtains. It usually takes multiple series of clicks for it to happen.
I can also get it to happen reliably 100% of the time by simply opening File Explorer (or seemingly any other Win32 application) without an existing instance. The distortion goes away as soon as I give another window focus.
Certain UWP apps (e.g., Microsoft ToDo, Your Phone, Calculator) don't seem to distort when they're first opened. Others (e.g., Curtains) distort 100% of the time.
Here's what this particular Curtains style looks like clean:
...and here it is again when the distortion occurs:
Here's one of Stardock's styles clean:
...and then again, distorted (note the borders extending beyond the window):