Completely white poro?

https://i.gyazo.com/21b62ff855d803079926c9caf7e4a569.png

Is this a visual bug? It was affecting all the poros in the game, for the whole game. The poros were normal the next games.

https://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2915779979/50373110?tab=overview