Vayne Ultimate Bug [GAMEPLAY]

After using your ultimate as Vayne, the last tumble withing the ending duration of the ultimate does not have invisibility. I'm not sure if it's a visual bug with the ultimate lasting longer than it should or the tumble has a bug, but it doesn't provide invisibility (doesn't show it as invisible either).

I'm not sure exactly how to recreate it but as I played I just

1. Press R
2. Tumble and auto and tumble and auto
3. When the timer is almost used up but the visual is still there press q
4. It shows as a regular tumble without invisibility

I don't save my games so I can't provide a video but it happens every game and every time I ult.