Using the naked eye zoom in general is delayed now in the new patch.
It takes about 0.5-1 second for the naked eye zoom to commence, so there's input lag/delay when holding RB now in the new patch.
Along with that, if you're in sprint, and holding RB to zoom, you do Naked Eye Zoom, and do a running heavy attack at the same time.
Seems like Zoom and Heavy attack are both binded to RB button which is bad.