As a lot of you have noticed, there have been issues with multiplayer. We've been working on it and now it seems to be working. You can try it out on the testing branch and see if there are any issues.
We had to update the networking libraries in order to make it work, so now it should be very stable in general. When we're sure everything is working well, we will update the main branch with the September Update + multiplayer fixes.
Sorry for the inconvenience, we still hope you've been able to enjoy the game.
Stay safe and keep nootin'!