Legends of Runeterra: Seeing an Opponent's Cards as They're Drawn

I was playing a game against someone who was clearly AFK when something strange happened. A few rounds in, when players drew cards at the beginning of the round, the opponent's card was briefly visible at a point during the animation. This occurred multiple times during the game. Has this happened to anyone else?

P.S. If anybody knows where I should be posting LoR stuff, please let me know.