<Jetpack Compose - mutableStateOf() not updating> ...

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Jetpack Compose - mutableStateOf() not updating
I got a ScreenState data class in my ViewModel:
data class ScreenState(
var isLoading: Boolean = true,
val items: List = emptyList()
)

and a mutableStateof:
private val _homeScreenState = mutableStateOf(ScreenState())
val homeScreenState: State = _homeScreenState

Updating the isLoading property works fine, the change gets send to my UI:
_homeScreenState.value = _homeScreenState.value.copy(isLoading = true)

But updating an item inside my List does not work.
Here is how I try to do...