While playing campaign as Wood Elves at about turn 160 (last turn of Chaos Invasion - they died durnig end turn) I had about +300 positive relations with Dwaves and military alliance with them. During end turn I recived diplomatic penlties for military and hero actions against Bretonia putting me at -2 relations with Dwarves, they declared war on me breaking alliance and taking other allies to join war on their side. After end turn diplomatic penalty for war with Bretonia was no longer there and I had +100 relations with Dwarves despite loosing bonuses for Chaos Invasion and reciving penalties for war with them.
It's not first time something like this happened but it is most distinctive. I was left at war with Dwarves, Empire and High Elves (they singend military alliance with Dwarves at the begining ot this end turn) who hade over 180 settlements together and -38 Amber.