In a recent game with the Stonecamp account, he played a Shepherd and it did not give him the option to discard the Overgrown Estate to it with its ability.
I don't know how to find the game ID or else I would link it.
Thanks for your post!
I replicated the situation, and in my game this worked out as it should. Can you remember anything special about the situation?
If you're in the game, the game number is found in the chat and reads something like
Joining game #8076135 on frankfurt.
where frankfurt is one of 3 servers. If you chatted a lot during the game, you might need to scroll up to find it.
After a game, a search at dominion.lauxnet.com can find the game numbers from rated games, but since all preview games are unrated, this doesn't help here.