win 10. ver is 22H2 build 19045.2251. Fence is 126.96.36.199.
I'm packing to leave on a trip, so I don't have time to make a video right now. But here's repro:
1. Via Windows Explorer window view of the desktop, I can see files and folders that are not visible on either of my two screens.
2. I click and drag the file from the Windows Explorer window to my visible desktop.
3. It appears for a second and then suddenly disappears from the visible desktop.
So it is still technically on the desktop, but only visible within a window view of the desktop, as though Stardock for Windows is trying to seek out what they think is the main screen and defaults to moving it into this unseen screen.