Hey there.
For my first game I decided to start as the Duchy of Munster. Later on in the game I granted my Heir the County of Ormond, making him the Lord Mayor (That County has a City as primary holding). At that time my succession law was Agnatic-Cognatic Primogeniture. When my ruler died he inherited the Duchy of Munster and Counties of Dublin and Desmond. However my succession law also changed from Agnatic-Cognatic Primogeniture to Agnatic Open Elective(Which is the succession law of Cities). Which now meant anyone could inherit, and my ruler died before I could change my laws, and some random Courtier inherited it.
As to how to reproduce the bug, find a county with a City as primary holding (not sure if this bug works with Temple holdings as well) and grant it to your heir as his only title. Wait for him to succeed you and that should do it.
For my first game I decided to start as the Duchy of Munster. Later on in the game I granted my Heir the County of Ormond, making him the Lord Mayor (That County has a City as primary holding). At that time my succession law was Agnatic-Cognatic Primogeniture. When my ruler died he inherited the Duchy of Munster and Counties of Dublin and Desmond. However my succession law also changed from Agnatic-Cognatic Primogeniture to Agnatic Open Elective(Which is the succession law of Cities). Which now meant anyone could inherit, and my ruler died before I could change my laws, and some random Courtier inherited it.
As to how to reproduce the bug, find a county with a City as primary holding (not sure if this bug works with Temple holdings as well) and grant it to your heir as his only title. Wait for him to succeed you and that should do it.
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