Broken promise bug

[EK834]

Some post-patch buggy diplomatic interaction:

I've spied on William before, got caught and promised not to do it again. I had the dark spying diplo hit. I've moved my spy elsewhere.

Then William gets caught spying on me and his spy gets killed by mine.

Instead of the usual apology screen and the usual choices William denounces me and I get the modifier for having broken my promise not to spy again.

The save is from a few turns before this happens.

 

[Adjuvant]

Today I also experienced this exact bug, but with Korea. Notification log will show my spy succeeded in stealing tech, was promoted but was discovered. I agreed to stop spying and moved my spy to my own capitol. Only a few turns later, I caught and killed a Korean spy in my capitol, my spy was again promoted in the notification log, however now I suffer from "broken promise" diplo hit with Korea.

Saved game included, check notification log for cited evidence. There's no other way this could have occurred. My spy has been promoted twice as per the log, and no other actions were taken by this, my only spy.

 

[danaphanous]

I had a bug like this, but instead of it saying I broke the spying promise it instead said I broke the land-purchasing promise. Interestingly though, both times this bug happened (seen it twice so far in the 4 months I've been playing) I had actually refused to not purchase land near him and had checked and seen the negative diplo points: "He asked you to stop purchasing land near him and you refused!" message. Still, both cases about 20 turns later he shows up declaring I broke the promise I never made. The second time it happened a few turns later it actually said I had honored the promise, so apparently you can do both? Or maybe they just lie? Don't have any saves on this problem as I forgot to take a screenshot or record the year it happened.

 

[danaphanous]

Or maybe, and this might be the problem, natural, cultural border expansion counts even if you don't do any buying?