Hi, I had a game with those three cards (game 160174019). If you use Continue to play a Wayfarer, then choose to gain a silver, I believe you should draw an extra card because of Footpad. The current implementation does not allow you to draw an extra card.
I'm not sure if there are undos involved, but the only time in the game where Continue was followed by playing and gaining a Wayfarer, no Silver was gained.
But I know that the implementation of "Return to your Action phase" has an incorrect timing on dominion.games, so it seems plausible that the Silver gain is handled incorrectly with regard to Footpad.
There were undos. I took the silver hoping to draw an extra card.