Vanechka
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I don't know if it's a bug or a feature, but:
Let's say there's a section of the map where there's water at the top and land at the bottom. Border gates are placed on the border between the water and the land. Now, if a hero who visited a tent disembarks through these gates from a ship onto land, another hero can then board that ship and end up in the water beyond the gates. In other words, they can pass through the gates without visiting the tent.