A little bug I've found with Montana

So it’s pretty an old-ish bug that I’ve found during the CTT and while investigating and observing the game since then, I’ve seen the problem hasn’t been resolved yet. The bug is whenever you start shooting with Montana’s Mini-gun, it’s FX animation doesn’t seem to appear at the beginning. Only when you activate one of his abilities, such as Hailstorm, it would be back to normal. A little bug, but a really annoying one tho.

Without the animation:
image

With the animation:
image

You can see the bug in-action on this video: https://www.youtube.com/watch?v=ZSPbXskI2To
Move it into 2:52 (=The actual bug), and then move into 3:02 (=When his Hailstorm has reached to it’s end).