I added a ticket as well. Judging by the feedback I've seen I'm sure the endless war immunity bug is well known and already squashed for the next patch.
On a side note;
It is turn 365 and not one shot fired in my space yet which is pretty unique and is giving a nice cold war feeling for a 4x.
I got fleets just waiting at the Iridium boarders for the battle of the bulge. I have been mobilizing forever and I'm gonna start parking them right out side there planets to hopefully provoke them. Also I'm gonna run the turns until my PR gets to zero and see if it gets into the positives again.
Anyways, just killing time till the custom races and all the other diplomatic options and space goodies are added.