Using the stone recipe for smashed meat throws an exception on the server then my game disconnects. Surprisingly, I still get the finished smashed meat in my inventory after reconnecting. Using the mallet from Acorns mod or normal hammers works fine.
The server throws warnings about game-{stone} or something. So I looked at the json recipe. Seems like there's an error in the returnedStack field so I tried removing it. It works. No more warnings and disconnects. The stone gets consumed though.