GetCurrentMapZoneIndex() return wrong values?

[SnowmanDK]

I noticed that Destinations shows all the POI's as unknown now.
Further investigation shows me that GetCurrentMapZoneIndex() returns a value ONE LOWER than before the latest update for ALL areas.

Example:
While in Deshaan, GetCurrentMapZoneIndex() should return 11, but it returns 10.

Did I miss something or is that a bug?