Before update today I started a Desert Astrolabe realm and saved after completing some of the POIs. After installing the update I reloaded and noticed that the "desert" map was now showing a swamp realm map.
I'm unsure how this will affect gameplay other than not being able to see the mesas on the map.
I got this on an ascended desert provisioner at two different difficulty levels, the map is still accurate in the middle but the edges show swamp type topography.