[GAMEPLAY] Riven abilities sometimes show her in the fog of war

While playing my last game I noticed that sometimes riven would suddenly become visible on my minimap when there was nothing that should have shown her. Paying closer attention throughout the game I noticed she occasionally would indeed pop up after casting an ability.

It does seem intermittent and only happened a handful of times throughout the game. However I could see it being an unfair advantage if she had been jungling instead.

I tried to talk to the Riven via all chat however they never responded to me. So I did upload a video to show what I saw. It was my first time using the new highlights feature, but I hope it helps! :)