Hello folks! It's not a major problem, but it seem like if you build something and both, you and your multiplayer mate is destroying it at the same time, you will get 2 times the item instead of just one. Furthermore, I'm not sure if this was before aswell, but now you can build everywhere, blocking, for example, NPC Routes, etc. Using the Stardew Valley Beta Update for Multiplayer. Trying to include more informations tomorrow.