Something very weird just happened to me while I was testing a mod. I had never seen it before, but seeing how it doesn't cause any issues I wonder if it is really a bug or just some obscure feature.
To summarise it without delay, I accidentally had my princess somehow merging with the army of my ally. Now she is listed in the "Agents" section of the other faction's army when I double-click it. And moreover, she gets moved around together with this army and regardless of my commands. However, I retain the power to simply move her out of the army to regain full control.
Notice, I am playing as the faction with black banners, and my ally is the faction with white banners. My princess is inside the white-bannered army.
I don't know exactly how this happened, though it happened not once but twice under the same circumstances. I had just sent the princess to negotiate with the army, then skipped the turn, and when I next looked she was marching together with the army. I'm clueless whether this is only possible because we are allies.
Has anyone else here ever seen this happen?