I use Koin with Jetpack Compose. I have to create a custom scope for one of my ViewModels as it should stay alive as long as the user is logged in.
I tried to do that in my composable, wrapping it in rememberSaveable and creating a custom Saver for that scope, but on every configuration change a new instance of my Scope was created. So I used one of my ViewModels as a holder for that scope. That ViewModel is single, so there is nothing to worry about.