Yes, so have I, and this is the intended behavior as far as I can tell. But in this case, it's not my duke that changed my allegiance, it's my ruler. Whatever code supercedes the restriction for the former does not seem functionnal for the latter.
If this could be fixed this turn, it'd be much appreciated.
I've seen a region be given by the ruler to a realm the region lord was banned in, and he switched it back the same turn.
