Hmm, could it be that you (as Maratha) were at war with Ottomans at the time? I have had taken over provinces with ports blockaded by a third party and had the blockade removed after the province transferred to my ownership.Hopefully this is an easy bug to fix :)
If a region gets taken over while its port is being blockaded the blockading fleet doesn't ditch the blockade.
While playing as Maratha I conquered one of the Persian regions (Persia I believe). At the same time the Ottomans who were also at war with the Persians had a fleet blockading the port. I had to destroy the port in order to get my trade in from Russia as the game had tried to use the port in the trade route.
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