Character keeps fosterling trait

[Veldmaarschalk]

Playing as duke of Bavaria, my son and heir, the count of Innsbruck sent me his son (Wilhelm) as a fosterling.

Then my duke died and the count of Innsbruck became the new duke, but Wilhelm his son keeps the fosterling trait.

 

[unmerged(2456)]

Already reported it here. Don't think the engine can deal with, but an event to remove it should be possible.