@Parcelize
class MyState() : Parcelable {
  private var _inputText by mutableStateOf("")
  val inputText by derivedStateOf { _inputText }
  val inputTextChange = { s:String ->
    _inputText = s
  }
}

rememberSaveable { MyState() }

The primary constructor is empty, no data will be serialized to 'Parcel'

Property would not be serialized into a 'Parcel'. Add '@IgnoredOnParcel' annotation to remove the warning

remember {}