Bug with running Dunes Map back to back

I just ran two Dunes maps (both T3) in a row, after finishing the first one, I portaled out from near the boss. When I entered the new map, I was placed right beside the boss, and the portal immediately despawned from where it spat me out, presumably to where it should have been, at the start of the map.

As you can see from the image, there is no portal to be found in the discovered area of the map, and a dead Blacksmith.