I posted this in the beta branch thread but it's too strange not to post here as well.
I've got some mysterious Trade Value flowing through my empire. Normally, I'd be happy to have free TV, but I'm an ME, so I have no idea what is happening. The system named Phonok in the picture below is especially confounding, since the trade route inexplicably stops right there. It can't be coming from the guy to my right, since they do not control any systems past our borders. Everything north of the system Mavall (just below CORE EXTENSION 015), following the hyperlane network, once belonged to the FP empire to my north, so I thought the trade route was a remnant of their stuff, but there was never a starbase in Phonok. I have tried clearing out the piracy, but it just comes back.
Strangely enough, I am actually collecting 5.38 TV, which isn't even the amount the trade route is worth. It can't be because piracy is reducing it, but I just finished clearing all of it. I have checked all of my planets and none of them are producing TV, which MEs can't produce anyway.
If it ended there I could accept it as a remnant trade route of the FP I attacked, but it gets weirder. I now have a trade route running across my core territory, which was never once controlled by an organic empire.
I'm going to build a starbase in each of these systems in an attempt to forcibly update the piracy. Hopefully that will work.
EDIT 1: The starbases only work as long as they exist. Even waiting a month so everything updates and then disbanding the starbased just makes the piracy come back. This has annoyingly already spawned a nothing little pirate fleet that I had to swat.
EDIT 2: I've found it! Some organic empire on the other side of the wormhole REALLY wanted to get that TV to their capitol. Thanks to
@metalosse for the tip. This is the most convoluted trade route I've seen thus far. I've closed my borders to them in response to this. I might take some of their territory for annoying me like this.