So an AI retired and left me all their planets, but they (and all their defending ships) were all now in the Altarian AI's ZOC. Which means I went from respecting Altarian personal space to flagrantly waving my nuts in their faces in one turn. I thought the open borders treaty we signed had me covered, but it had quietly expired (WHY DO THESE EXPIRE?? AND WHY DONT THEY SAY SO WHEN THEY DO?). So they went from 'close' to 'furious' in one turn and declared war on the next.
Earlier in the game, I was sending a cargo ship to establish a trade route with Thalan planets and THAT made the Thalans decide I was basically Space-Hitler. Shouldn't trade ships or really any ship with no weapons be excluded from the ZOC AI trigger, open borders treaty or not?