Or, it could be just a timeline thing.
When we're in the Core game areas, they are as the world was some years back.
We can see that some Risen remain mobile in the wake of Zhaitan's death, in Siren's Bay, I suspect that they are now simple, uncontrolled undead for the most part, with a few intelligent ones still hanging about. Whatever raised them apparently sticks once the one who raised them is dead.
There are no areas in the post Jormag and Primordus world, so other than the reports of Gorrik and Taimi, we don't know the state of any of the dragon's creations.