Not sure if this is a bug or not... a user on Steam informed me that this is a known issue, and I submitted a ticket with attached save files... but am posting here as well just to be on the safe side.
Playing a custom civ, not at war with anyone, zero battles, haven't done anything to anyone via espionage, etc. Have only met two civs, neither of which are the Drengin.
Suddenly, the Drengin inform me that my treachery has been unmasked, that I've assassinated their ambassador or some such, and that we are now at war. Then two things happen that seem buggy, but I can't be sure if this is an intended system or not that is simply a tad too opaque to the user.
1) The Drengin, despite evidently being at war with me, are not in my diplomacy contacts. Nowhere to be found.
2) The other civs now all see me as a warmonger.
Is this normal? Is there some mechanism in the game (I'm imagining the AI blaming something someone else did on me, or being tricked into thinking I did something they actually did themselves, etc. I haven't dabbled in the espionage system yet, so I don't know if that's possible.) And if so, is there a way to know that's happening?
If not, is it a known bug?