Same for LR1. Again, one of the bugs i wanted to post as a video... (there's more but not LR specific)
Happens really often to me. Most likely because I got to feel the shooting pace of LR so well I try shooting right after the gun has recharged, causing the desync of the animation and the actual shot. Right after the desynced animation starts playing, you can take a shot that will not be animated (but the beam will appear). If you keep on shooting then the desync keeps on occuring. If you wait for a while after the desynced shot then the gun goes back to normal.
Hint to mabel/whoever will fix this: feels like if the animation cooldown time isn't the same as the shot cooldown/recharge time.