I have noticed a bug in the diplomacy of the Empire, when I use the "War Target" to select enemy army (see pictures 2 + 3).
Middenland is my ally and when I select the enemy army of the beastmen, then I can't select this as a "War Tarrget" (see pictures 4 +5). Also by the "War Target" is nothing select of this enemy army (see picture 6).
If I do this at the campaign map to select the enemy army with the ally army of Middenland, then the "War Target" seems to work (see the pictures 7, 8 + 9).
And now you see this too in the diplomacy at the "War Target" (see picture 10).
You can't do this with an army from defensive ally, because I try this too.
This is very strange with the 'War Target".
I have the festtag update (see picture 1). And I never use any "beta" updates. Also I never use any mods.