The Regional Event 'Offer Honours of War' still doesn't work completely correctly against the AI.
I offered HoW to Kassel, next turn I saw the message string name 'offer_honours_of_war', next turn the message 'ongoing_honours_of_war' and the third turn 'unkown event type 198'. (actual text may differ slightly).
In the mean time nothing changed in the situation of the siege of Kassel.
Maybe it is just a matter of missing event strings, and the HoW were correctly rejected - but even then it takes a very long time for the decision to lead to anything.