No reproduction steps necessary.
This is surely an unintended oversight of the part of the designers.
All is fine in the earlier ages until a city or a fort (canal) suddenly gives perfectly good access to the rest of the oceans. The city may still just build work boats.
(On an archipelago where my powerful capital had a large inland ocean/lake, which had a 1 tile wide ring around it. My capital could thus not serve as military production city, and not provide any naval units, despite soon having access to the full oceans).
This is surely an unintended oversight of the part of the designers.
All is fine in the earlier ages until a city or a fort (canal) suddenly gives perfectly good access to the rest of the oceans. The city may still just build work boats.
(On an archipelago where my powerful capital had a large inland ocean/lake, which had a 1 tile wide ring around it. My capital could thus not serve as military production city, and not provide any naval units, despite soon having access to the full oceans).
