zolobolo wrote:When accepting the Tinker peace offer, the player stance towards another one of its enemy: the Yoral changes also to peace
Tinkers and Yoral are not in allaince which might cause this indirect effect - accordng to the new diplo screen rthey ahve a yellow line in between them, assume this only means they have trade deal
On stardate 1351, the Yoral declared war on you for "your persecution of the kind Tinkers". They did this because the Tinkers requested their help against a mutual threat (your Ashdar alliance). So for the duration of the war, the Tinkers and the Yoral have been "in coalition", which means not formally allied, but, still cooperating against a common foe. "Coalition" states are a new thing, I added them when I was reworking the peace offer logic last month. They're necessary, I think, to prevent some strange edge cases that otherwise come up when resolving peace offers.
That said -- coalition states aren't very well advertised in game. The only way you can tell if two AIs are acting in coalition is to pay close attention to the declare war and peace offer text -- which will mention something about their reasons for wanting war/peace. The yellow line visualization you noticed means "in coalition", but, it's actually a dev feature that will only be visible if you've switched on the hidden "ai dev" option (which I assume you have).
When the Tinkers sue for peace on stardate 1356, they do say that they're suing for peace "on behalf of the Tinker-Yoral coalition". So.... long story short, I think this is all working "as intended", but it's a new feature, and perhaps not as clear as it could be.