Diplomacy bug RotS - Taira

[soutrain]

Hello,

Playing Singleplayer Campaign RotS, The naval-Taira. Im in Round 22. Longest Campaign.

My Diplomacy status to My Sister Clan (which i am still allied) sinks dramatically in Round 22 by -198 points due to broken agreements. I never have broken any agreement with them though.
Interestingly, my status in diplomacy-menu changes from friendly to hostile (due to the negative score), but they dont declare war and I am still fully allied to them + commercial agreement.

I loaded savegames from some rounds before and played it again but there it is still the same. Around round 22 (+-2 rounds) there is this -198 drop.
Also I noticed that a similar dropp occurs some rounds before where I get a -48 penalty to my sister clan again dued to broken agreements. This effects than declines over the next few rounds but again at R22 I have this incredible penalty from -198. I am far away from Realm Divide.

Is this normal?

[RMSN NIKE]

It is probably when they broke their vassal alliances, they have 2. It is not anything you did, it is them.

[soutrain]

Seems to be right, after this event they are very negative to all other clans in japan.