Reload map tiles every onResume.

[sekitaka]

Hello, I have migrated the mapbox sdk to 6.4.0 from 5.1.5.
Then, It reloads map tiles every onResume.
Is this new specification?

Steps to reproduce

1. activity A that has mapview starts.
2. activity B starts by button on activity A clicked.
3. back to activity A

Expected behavior

Keep showing map tiles same as when left from activity A.

Actual behavior

Reload map tiles again.

Configuration

**Android versions:7.1.1
**Device models:PH-1
**Mapbox SDK versions: 6.4.0

[sekitaka]

My activity code is here.

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        Mapbox.getInstance(getApplicationContext(), getString(R.string.mapbox_access_token));
        setContentView(R.layout.activity_main)
        mapView.onCreate(savedInstanceState)
        mapView.getMapAsync { mapboxMap ->
            mapboxMap.addMarker(MarkerOptions()
                    .position(LatLng(41.885, -87.679))
                    .title("Chicago")
                    .snippet("Illinois")
            )
        }
        button.setOnClickListener {
            val intent = Intent(this, SecondActivity::class.java)
            startActivity(intent)
        }
    }

    override fun onStart() {
        super.onStart()
        mapView.onStart()
    }

    override fun onResume() {
        super.onResume()
        mapView.onResume()
    }

    override fun onPause() {
        super.onPause()
        mapView.onPause()
    }

    override fun onStop() {
        super.onStop()
        mapView.onStop()
    }

    override fun onSaveInstanceState(outState: Bundle?, outPersistentState: PersistableBundle?) {
        super.onSaveInstanceState(outState, outPersistentState)
        outState?.let {
            mapView.onSaveInstanceState(it)
        }
    }

    override fun onLowMemory() {
        super.onLowMemory()
        mapView.onLowMemory()
    }

    override fun onDestroy() {
        super.onDestroy()
        mapView.onDestroy()
    }
}