They said Yason with a Y is being discontinued so the newer features dont work for him, at some point he will dissapear from the game and probably reappear as a proportion variation for sethro.
The newer Rig system currently bugs out for more character it seems they should rather make it a General Prototype problem in the Changelog that can appear for any adapted character under different blendshape/bone animation circumstances for now.
Same for the AI there is more going on then just a per character problem their it's a General AI System problem, where even the entire pathfinding can brake unexpected.
Though i never have seen Chackars proximity awareness failing in the fight with him "combat system training sequence" so i indeed wonder why Hyena fails so often unexpected, most probably depending how you approach the path to him/her/it, away from the rather developer expected full linear triggered approach to it.
Kral failing with a simple pathfinding routine (go to the target) operation is i dunno.
Skyrim isn't that problematic and that says something
These are important Core functions for every following production.