I was playing a game with Fixed alliances on(call me crazy for setting that on in diplomacy, but i wanted to see what changes there would be) and I had set it to me + two easy and normal AI versus a single vicious AI and I was vasari. late game I had the highly attuned sensors upgrade (all phase jumping on map revealed) and I saw something quite odd the vicious AI was sending a mass of about 9 herald envoys (advent) between there home world and a nearby asteroid even though it had no allies. So I thought this was most definitely a bug and I should report it since testing on fixed alliances is most likely minimal compared to otherwise.