[2.4.3 v3]bug when claimant faction of vassal's title succeed

[abcdgh]

before the claimant faction of duchy of savoy succeed, i got all the land from Forez to Valais, and Piemonte as well
all these six counties belonged to the duke of Savoy, who was my vassal
and after the faction succeed, there are two bugs occured:
1.the former duke lost Savoy become independent holding Piemonte
2.the claimant who was unlanded get the duchy and the county of Savoy and become the vassal of England

the second bug i've seen before( still in 2.4.3 v3)

here is my ironman save file before and after the faction succeed, you can check it:http://1drv.ms/1J17biK

 

[abcdgh]

another time, the faction succeed and the duke of savoy become a vassal of Jerusalem, are u kidding me?