Unexpected disconnect reset trial of the Sekhemas

I had defeated the final boss on floor 4, claimed my ascendancy points and opened 1 chest when the game simply said "An unexpected disconnect has occurred."

My network latency meter was up and it didn't show any signs of trouble so I think this was server side. I was able to log right back in again, but it put me at the start of the trial with none of the 12 keys I had remaining. I guess I should be thankful that I still have the ascendancy, I guess.