Tristana becomes invisible after being knocked out of her Rocket Jump by Poppy's Steadfast Presence

This happened twice in a Sivir/Poppy vs Trist/Thresh bottom lane matchup. I played Sivir, my support played Poppy.

Watching the replay of the game, you can clearly see Trist land outside of the bush closest to their lane and then see both of us wandering around both bushes without finding her. There was no Thresh lantern involved.

Steps to replicate:

1. Tristana begins rocket jump within range of Poppy's W (not activated)
2. Poppy activates W
3. Tristana is brought back to the ground, but remains invisible for a short time.