Well dont know if someone else also tried to have this bug, but here goes.
During gameplay I invade a planet with a custom buildt transport ship, only problem was that it dident disapair after the invasion, meaning that I could keep invadeing with the same ship over and over.
while fun at the first two planets, needless to say this gives a huge unfair advantage which made it a bit too easy to complete a game.
Just thought I would let it be known that stuff like that also happens!