@BKeyport I believe you are right. I had the same issue. I tried to run the xrandr query and I could not print the displays. I looked everywhere, the only solution I found was to switch back to X11. This was the only way to get the electron option to treat the screen as a single screen and move the display to the second monitor.
Anyway, thanks a lot, reading this post solved my problem and I was trying to figure it out for a while !