I have just recently encountered a bug in regards to Military Alliances declaring war on me. When the allies are destroyed, leaving only one member left thus causing the alliance to dissolve prompts a diplomacy box to indicate that said faction has declared war on me. In this case its Yuan Shao (who would of guessed eh?) but when I click on his forces or settlements, which are tinted red to indicate we are enemies, nothing happens. Its like the command does not register and my force just remains still. But if I sign a peace treaty with them, I can now fight their forces and even siege their settlements, but when I check the diplomacy screen it shows that I am not at war with them.
I have tried looking for similar posts but I haven't discovered any relatable sources so far.
I'm actually currently fighting Yuan Shao right now while we are at peace, about to take the farmland of Ye Since he just took some land I bought just after last turn that bastard! while we are at peace too, that bastard!