Well, three years later still a no no with sheathes (sorry I couldn't find the most up to date post on this issue...)
Going all out on cinematic view and close up graphics yet not doing this is really weird.
Take note Larian FF XVI does it really simple and well (doesn't have to cover the whole weapon, letting you use one asset for multiple shapes) :
![[Linked Image from i.ibb.co]](https://i.ibb.co/vJMKbkv/Screenshot-2023-06-21-at-7-56-41.png)