setVisibility error in Android P: method can only be called from the same library group

Hi everyone! I'm developing an Android app in Kotlin and encountered a very strange error when trying to hide or show a `VisibilityAwareImageButton` on Android 9 (Pie). I have a simple code snippet: ```kotlin class MyFragment : Fragment() { private lateinit var myButton: VisibilityAwareImageButton override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) myButton = view.findViewById(R.id.my_button) // Trying to hide the button myButton.visibility = View.GONE } } ``` When running on Android 9 (API 28), I get an exception: ``` java.lang.RuntimeException: VisibilityAwareImageButton.setVisibility can only be called from the same library group (groupI ```