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Now another question: is it supposed to be like this, that the tile the hero is currently on IS purified, but the 3 adjacent tiles not only not purified but also can't be walked on by the hero? Is this tile some kind of a dead end that does not allow further expansion?
I got the first bug reported here fixed for .708. It won't fix existing chunks, but, that issue won't come up in new chuncks again.