I entered a normal singleplayer game of billiards at this specific table. This hasn’t happened to any of the other tables in the next room.
I went to bounce off a wall to sink a ball in, but the side made me clip through.
I wasn’t able to get back onto the pool table after that point. But hey, I was able to move around the billiards area and even all the way over to the dance floor!
Thankfully, I was able to leave the game by simply doing ‘ESC’ -> ‘Leave Billiards’.
Weird stuff man.