см. GitHub ... можно обойти проблему:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (mSharedPreferences.getBoolean(KEY_PREF_RECREATED, false)) {
mSharedPreferences.edit().putBoolean(KEY_PREF_RECREATED, false).apply();
// start LOCK TASK here
} else {
mSharedPreferences.edit().putBoolean(KEY_PREF_RECREATED, true).apply();
finish(); // close the app
startActivity(new Intent(this, MainActivity.class)); // reopen the app
}
setContentView(R.layout.activity_main);
}