I played as TEC Rebels last night and encountered a small issue. I was TEC Rebel and in Diplomacy research there is an upgrade that makes all neutral NPC (thoses around planets) and Pirates friendly to you.
The pirate stronghold was wiped out by an other player (I think we super weapon Novalith) and the pirate stronghold was free to colonize. AI couldn't take it because there was still the pirate fleet around it. As I was frendily with them I could colonize it.
Starting for this moment, the "pirate annoncement" musique kept being played in loop. I think this music is played when a pirate fleet arrives to one of the player gravity well. And as I took the pirate stronghold and that the pirate fleet was there doing nothing, the game kept running the annoncement muisque.
Not a big issue, but kind of annonying. I guess a fix would be to not have that music when pirates are friendly to you. I think pirate fleet may have been bugged as pirate faction was considered DEAD (in underground menu) since their stronghold was destroyed. So they still had a fleet there sitting doing nothing.
I may have an automatic save of that game if needed I can dig it up.