It’s one of the certification requirements for Oculus Go/Quest. When you quit your game, it has to shut down, as it does on PC. Since Go/Quest run Android, I guess Oculus expects devs to use standard means to shut down the app. UE4 used to do that up to 4.19 and after 4.19 Quit Game stopped working on Android (and since it doesn’t work on Android in 4.23 either, I don’t think they will be fixing it).