How are nav-direction "enter, exit, & swap" supposed to behave?


I am trying to understand the expected behavior for navigation direction. The available directions are: forward, back, enter, exit, swap. I created a demo (see link below) to test. The forward and back directions animate as I expected. Enter, exit, and swap don’t seem to animate at all for iOS or Android. Does anyone know their intended behavior?




I have the same issue, is there a known fix?