The new system doesn't seem to update rank and allegiance in a number of places.
For example, if I write to "all of my knights", one of the nobles having an estate in my region isn't contacted, and he doesn't have the rank of knight either.
Possibly related, or not, is with the armies, since assignments works per the new system in funny ways. We had a marshal of an army that was also still SiC of the other.