Arena throne of eldraine best of 1 attack issue
Opponent had 2 creatures in play. Animation showed 1 attack, audio was the sound of 1 attacking. I declared blockers on the only one showing as attacking then the game showed the other creature he attacked with tapped. Neither had vigilance. No other relevant abilities. The creature that didn't appear to attack was a garenbrig squire. I was at 1 life. This animation bug cost me the game as I had lethal on my next turn and he had nothing to block my flier with.
His board state included a fires of invention, no cards in hand a creature enchanted with my charmed sleep.
Playing on a PC desktop with windows 11.
No screenshot because it happened, killed me and moved me out of the relevant game state.