Egui window starts minimized. I think I had this problem with WebGPU aswell. If I set window to start maximized in egui it flashes fullscreen then minimizes again instantly. When I click on it from the exe file it starts the way I want it too. But if I run the exe from the command prompt it starts minimized.
edit: If i set min_inner_size, and set maximized to true. Then it flashes maximized. Then minimizes. Then opens behind the command prompt at the min_inner_size.