I was just playing a game in 1066 as Guilliame of Aquitaine. The law was set to semi-sallic primogeniture and I had an adult son who was in my court, as my marshall. Guilliame died, and, at the time of his death, was Duke of Potiou and Count of Potiou, but, instead of his son inheriting the titles, on the map, the shield went blank, and I was unable to get into the province management or court screens. His son was still listed as Duke and Count on the son's biographical page, however.
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