Confirmed A.E.I.O.U. and Me; Heir changed randomly to my second Grandson instead of my firstborn Son

[Fetenepi]

Information​

I have verifed my game files (Steam only)​

Yes

I have disabled all mods​

Yes

I am running the latest game update​

Yes

Required​

Summary​

A.E.I.O.U. and Me; Heir changed randomly to my second Grandson instead of my firstborn Son

Description​

I married my firstborn son to the Duchess of Austria. After that I married their first Son to the Duchess of Steyermark. Ecerything worked fine until I got a Notification that my second Grandson will be my Playerheir. Nobody died, no eventchain that I noticed.
The Succession Law Confederate Partition says. "all children inherit equally" so as long my male children are alive, the grandsons shouln´t inherit, right?
I added english Screenshots, sorry for the german ones.

Edit:
I killed my second Grandson, after that my third Grandson became Player heir, after killing him too the only child of my second son (a daughter) became player heir. So the game completely ignored my three living sons and my first Grandson. I couldnt go any further, because my liege revoked my title, which led to a Game over.

Steps to reproduce​

see description, it was a random Notification. Savegame is unfortunately in Ironman mode

Game Version​

1.9.0.4 Lance

Platform​

Windows

Additional Information​

Affected Feature​

• Gameplay
• Achievements

Save Game​

View attachment A.E.I.ck3

Other Attachments​

View attachment A.E.I.ck3

 

[Riwrow]

Hello there! Thank you for bringing this to our attention, we have now confirmed the issue and added it to our database!