Tomb Robber

Indeed, it's strange that I didn't notice it, it happens.

I played the scenario. After clearing the surface, I couldn't get into the tomb... The two-way portal (with an indicator) is inactive, and I can't enter the tomb because of the blue key guardians. When I try to teleport using a cheat (to the only place on the surface), a message from Hafiz appears, saying that he has been in the tomb... And when I try to go further (removing the purple key, or so it seems), into the second two-way portal, the game says "You lose..."