Whenever I build my Qt application with a separate display connected, if I drag my application onto the display, then close the application and disconnect that display, I am unable to rebuild my application on my main display until I reconnect that second display and then it will build and pop up on that second display. I have noticed this bug across several different monitor setups, from being connected to a TV to normal smaller monitors. The solution to the bug has always been the same, to reconnect the monitor and rebuild.

"QSGThreadedRenderLoop: expose event received for window MainRootWindow_QMLTYPE_620(0x279e5b4ab20 active exposed, visibility=QWindow::Windowed, flags=QFlags<Qt::WindowType>(Window), geometry=-2336,-1933 1924x1055) with invalid geometry: QRect(-2336,-1933 1924x1055) on QScreen(0x279e0d3bb50, name=\\.\DISPLAY1)"