I'm not sure if this is a bug so much as a (il)logical combo of features, but:
With a viking longship, you can pillage say a settler. That settler is brought 'aboard' your longship on the coast.
However, if you don't have shipbuilding tech yet (which allows land units to embark), the settler is just stuck on that one water tile. It can't move with the longship. It can't go back onto land. It's just stuck.
With a viking longship, you can pillage say a settler. That settler is brought 'aboard' your longship on the coast.
However, if you don't have shipbuilding tech yet (which allows land units to embark), the settler is just stuck on that one water tile. It can't move with the longship. It can't go back onto land. It's just stuck.