Secondary item becomes invisible while shooting bow

What I expected to happen was:
The secondary item would go away slowly

What actually happened was:
It went invisible, no animation, just gone.

Steps to Reproduce:
1: Get any item in the Secondary slot (the new slot next to armor)
2: Get a bow
3. Use the bow
4: The secondary item will dissapear, and reappear after your shot.

-It only goes away in First Person, not in Third Person (F5)-
-The item will not get deleted, it just becomes invisible while shooting-
EDIT:
I also made a video and posted this,
https://www.youtube.com/watch?v=xQy2uhx_nNs&feature=youtu.be