Erm... did that even happen in vanilla bts in neutral land? Pherhaps it did, but I would hate having to click "no" to that question as that would happen far more often than clicking "yes".SO is still the Best at findin' bugs.
EDIT: Why is it now that my Mil units can occupy the same tile as another AI mil unit without the pop up asking if I want to declare war? I have No treaties with this empire. And No option for HS/SM/etc. Vanilla BtS combat Option On. I want to attack these units. And they moved onto my tile were the horseman is.
Just alt+click the nation in the score list that you want to declare war on.
Edit: perhaps it should be possible (or already is?) to hold down a hotkey like "alt" when moving the unit to automatically declare war and attack the nation that may occupy that plot.