The King in the Mists are stuck invulnerable on wooden platform

bug report ref. number: 1,487,448,884

After maze phase, the King in the Mists are stuck on one of the wooden platform, which prevents him from transforming to phase-2.

Using portal scrolls doesn't open portal, so I have to logout to leave the arena.

Going in the arena again from hideout doesn't solve the invulnerable king, making the entire encounter incompletable.

Bought 10 audiences and had the same bug on the 4th encounter. Did the log out to character selection, rather than running through the maze.