Map visual bug, possibly specific to Nunu

https://i.imgur.com/FZXh8Dm.png

It's a little weird, since it isn't shown on the replay, but what happened was I had vision of Nunu and pinged it. But what I was seeing was apparently where he had been several seconds prior, because to both me and the mid laner I was warning, it seemed like he just blinked instantly from where I pinged to mid lane.

I don't know what caused the bug or what could possibly recreate it.

It may have been due to the fact he used his snowball, since forced movement like that sometimes bugs out like this.