I was working on a Rocket League inspired minigame in UEFN. After having the RL mechanics itself in place, wanted to do some extra stuff in the arena to make it more interesting.
When I saw the Pinball Bumbe and Pinball Flipper devices, I was very interested in using them in this mini game.
However the ball from the Ball Spawner device doesn’t get any pushback from those pinball devices. 
The player and the RL car get pushback. But when the ball hits those devices, I see the animation and hear the sound effects of the devices trigger. But no pushback is applied on the ball.
Big shame as you would think the two would interact perfectly!
Edit: I used the newer Ball Spawner device, not the legacy one. The legacy one seems to get pushback form the Pinball devices but is more laggy.