Problem in Trial of Chaos

Just like in Trial of Sekhemas if your internet connection drops you can return to the room you were in, this does not happen in Trail of Chaos.
Yesterday I had already killed the last boss of Trial of Chaos and was going to collect the rewards, when my connection dropped. When I returned it DOES NOT let me enter the place I was in again. It asked me for a new key to enter.
It would be great to be able to fix this problem.
Thank you very much.