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I have two pirate fleets sitting just outside ports on a permanent basis. They never move and never attack. They just sit there. It's been about 50 years now.
There's a bug that makes ships get stuck outside of ports. I have a very unofficial and unconfirmed conviction that it's caused by alt+tabbing when game is at max speed but like I say it's just a wild guess based on the very few times it happened to me.
Maybe you could contribute your save game so devs can see the problem themselves?