Ok, I already found out that the alternative route was in the blue area by means of an elevator. Many thanks.
But still, I would like to ask you for just two more things:
1. Could you also add the input of the command by left alt + space? (Because my current PC doesn't have right ctrl).
2. I also found another bug in which if you reach the roof of the entire map and move forward, you fall into the infinite void.