Hmmm interesting. I don't have a lot of time to confirm, but its an interesting find.
But one thing I would like you to do before drawing any conclusions:
What if you don't build any sea trade buildings (only ports themselves). Do you still get 3 fleets with say a dockyard (and 1 with port, 2 with shipwright) without having any of the sea trade buildings?
Also, can you please test this while not running any mods?
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