Android Jetpack Compose mutableStateListOf not doing Recomposition-CodePudding

So, I have a mutableStateListOf in viewModel:

var childTravellersList = mutableStateListOf<TravellersDetails>()

TravellersDetails is a data class having a field called error.

this childTravellersList is used in the UI as:

val list = remember{viewModel.childTravellersList}

LazyColumn(state = lazyColumnState) {
    itemsIndexed(list) { index, item ->
        SomeBox(show = if(item.error) true else false)
    }
  }

I have wrote a function in viewModel that updates error of TravellersDetails at given index of childTravellersList as:

fun update(index){
    childTravellersList[index].error = true
}

So, whenever I call this function, the list should get updated.

This updates the list, but UI recomposition is not triggered