Final Boss Veigar skin bug?

could just be me, but the gold animation you get for last hitting is either being bugged at times or not showing up. been noticing this for a little bit now. been many times i knew for sure i killed a creep but didnt see the animation so was fooled into thinking i was too early / delayed. but i was literally clearing waves with no close allys or minions to steal the last hit and this has occured where it isnt accurately displaying i got the kill / gold. nothing major, but would appreciate if someone took time to help confirm this or if riot is aware to get this skin and its animations up to par with the basics so it isnt so distracting. thanks