[maze] Robot can't see invisible floor anymore

After the puzzle with the invisible, blue-glowing floor is done for the girl, she use the elevator, and the robot can't see the floor anymore.
Plus when the robot fall and die, the respawn point of the robot is in the tower in the middle of the maze area, so a part of the puzzle for the robot is skipped.

Fixed in 0.013. Thank you!
As for the respawn point of the robot, it needs to be in the central tower unfortunately so that the player don't travel too much for the next gameplay.