So I went on FFA PvP today when I was giving my friend a tour, and I found the front entrance to the arena was blocked off. I have no idea whether it was a bug or not, but by standing on the gold that was barricading the front entrance to the arena, I was put in survival mode as if I WERE in the arena. Please check the screenshot to see more. (Things may look a bit weird due to the fact that I was using the AD Reforged texture pack at the time of the screenshot)