Invisible Jarvan After E-Qing into Poppy W in Dragon Pit

My friends and I encountered a strange bug involving Jarvan briefly turning invisible after E-Qing into Dragon Pit. Particle effects from his abilities were still visible, but his model was not. Unfortunately, the invisibility isn't reproduced when watching the replay, even when switching Fog of War on for red team. The other team was surprised when we told them, so it seems he was invisible for all of red team but none of blue team.

Skip to around 18:00 in the replay to see when the bug occurred. Jarvan turned invisible as he E-Q'd into Dragon pit, which led to us wandering around wondering what was happening. He reappeared a few seconds later when ulting near Blue Buff. I imagine it was due to an interaction with E-Qing into Poppy's W — it looked like he was being forced back into the wall (see Jarvan stuttering forward before activating Tiamat).

Wish I could have provided a live recording, but none of us record our gameplay. Hopefully this is enough information to track down the bug! :c

Match history link: http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2121430857/1 Replay.gg link: http://www.replay.gg/search/na/Pewqazz#2121430857