Since .80 (possibly since .75 - they deployed so close together I'm not 100% certain when this started), factions under a Tribute treaty have been placed in a NAP-like state. Specifically, if an AI has offered me tribute (and I accept), I cannot wardec them or tell them to GTFO my property for 30 turns. Somewhat more annoying, they will still mouth off at you if you go near/in their borders, even though they're supposedly "buying you off" and can't actually kick you out of their territory either.
For instance, I was just recently in a Tribute situation with Resoln (who started near me on Bay of Capacea and, for whatever reason, never expanded well and is quite weak. The arrogant pissants had the gall to tell me to go away because I was "too close to their borders", and I didn't have the ability to whip them for it because they're currently paying me gold! (Of course, the Tribute treaty is now over, so they're going to die for their insolence = P)
Tribute is not a NAP, it should not be treated like a NAP. I should be able to crush any opponent, whenever I want, under any circumstances EXCEPT being in a NAP.
So please fix this, if only so I can properly beat stupid AI monkeys for mouthing off.