Looking at the new addition to the map and comparing it to the old one i will make the assumption to say that the person to cartographed (grammar?) Aldernard was not the same person to chart Othard nor Ilsabard. The old map was crumbling near Ilsabard which may have been the original authors way of implying that you probably shouldnt go there. The new one is just foggy to imply that theres something there, but we dont know what.

The style in which the new area is drawn in is also much more colourful and detailed. Aldenard is one unicoloured lump of landmass while Othard is colourful and detailed throughout.

I will make the claim, that whoever drew the original map did not add Othard. At least not in the first draft. This would also help us understand why we first got this version now as opposed to simply having a perfect map from the start. The Original map is common in- universe and Othard is often described as being faraway and mystic in nature.