I can confirm this.
in first person view, while prone, when you look down the sights of your main weapon you will see the crosshair dead centre while performing the roll. the camera doesn't change and there's no animation of the player's body visible.
This is not the case with a side arm, where the animation and camera changes correctly.

I confirm this too.
in third person view, the animation plays correctly as well

This issue was processed by our team and will be looked into. We thank you for your feedback.

Please keep the issue monitored to see when it is fixed.

Closing in favor of higher voted ticket #858. Repro steps and dev assignment were merged.