[GAMEPLAY] Vayne Zhonya - Silver bolts on multiple enemies

I was playing a game of Vayne and was against an enemy who built a Zhonya. I auto-ed him twice, then he used the active. While he was shining gold, I auto attacked something else, applying silver bolts, but the stacks on the Zhonya-d champion did not expire, and I triggered it with a third auto after the invulnerability expired. Since the timing window is very small (Silver Bolts expire after 3 seconds and Zhonya Invulnerability lasts 2.5) I was unable to re-create the moment in a custom with a friend. But I hope you will look into it in case it was not intentional.