Labyrinth "lost" while the (winning) end game was just starting

Strange thing happened in the labyrinth today. As soon as I moved to the "end" tile (so at the start of the battle with the end boss), I immediately got the "LOSE" evaluation on my screen. It was the very last move I could do.

As you can see in the first screenshot, the battle with the end boss was going on in the background. The second screenshot shows I won the battle. Since the game claimed I lost the labyrinth attempt, I didn't receive the token and also missed the rewards for defeating the extra boss(es).

I tried to replicate the issue with a second attempt, and also on server 1 "Wrath of Odin", but phailed.

Attachment 155 Attachment 156
Elke-Sarah @ server 7 "Bow of Athena" (UID 505081), around 3:45am server time.