https://bugs.winehq.org/show_bug.cgi?id=50717
--- Comment #3 from tempel.julian@gmail.com --- I've confirmed the issue with regular wine 6.2 with a clean prefix: Start Windows version of Unigine Valley with D3D11 -> WineD3D. The launcher doesn't trigger the 1x1px unmanaged window, but as soon as you start the actual program with 3D rendering, the 1x1px unmanaged window occurs. It apparently occurs with any 3D game in Wine.