Actually it doesn't seem like a bug to me. You have to do that to take Timbuktu and the coastal city (Arguin?). Think of it as you are the first person to explore there from the civilized world, and nobody has even MAPPED it yet! Its not like normal fog of war where there are at least maps to show you the way, its a region on the map that no one from Europe or the Middle East has ever been to yet.
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