Workaround for Bottom Navigation with Jetpack Navigation 2.4.0-beta02

JetpackNavigationActivity.kt

override fun onBackPressed() {

    /**
     * We only override the behavior when back to home from other menu
     * else we leave it to the default [onBackPressed]
     */
    if (bottomNavigationView.selectedItemId != bottomNavigationView.menu[0].itemId) {
        val previousDestination = navController.previousBackStackEntry?.destination ?: run {
            /**
             * on the root, left it to default [onBackPressed]
             */
            return super.onBackPressed()
        }

        /**
         * in case the first menu/tab is not a nested graph
         */
        val previousId = previousDestination.parent?.id ?: previousDestination.id
        if (previousId == bottomNavigationView.menu[0].itemId) {
            /**
             * We let [BottomNavigationView] to switch to home
             */
            bottomNavigationView.selectedItemId = bottomNavigationView.menu[0].itemId
            return
        }
    }

    super.onBackPressed()
}