Inside the PSG box, a tense moment unfolded as Willian Pacho clipped Alexis Mac Allister, who had done well to shield the ball and draw the contact.
Referee Maurizio Mariani immediately pointed to the penalty spot, sending the home fans into celebration.
However, after reviewing the incident on the monitor, he reversed his decision, prompting loud boos around Anfield.
Arne Slot reacted angrily to the call, clearly frustrated as he gestured toward the referee.
