I came back to the beholder lair in Ch. 6 to do the new maze dungeon, and the entrance to the maze seems to be disabled. What happened?

If I remember correctly, it's not possible to return with a high level party and do that part of the game when you are too strong. Did you try it in chapter 5? The entrance was working then?

I figured. That makes sense, but maybe in the next version you might add some kind of warning that the stairs will close if you leave the underdark... Maybe in a loading screen tip? Thanks