MUSTDOS

I just tried the latest build of OBoE and with the Valley of Dying Things scenario I went westward until I found the cave in which I was supposed to use to escape the school's dungeon and went through the stairways After that, I went to Sweetgrove and the scenario ended as me winning the game; is this a scenario bug or a game related one?

Can Open Blades of Exile run the original Exile 1, 2 and 3 in any way?