His shoulder/hand etc looked off and in front of the last player. Either those VAR replays are not the proper ones or these guys are lost in the sauce.
It's a genuine question lil br0.
I thought Livakovic was on and there was no need for a retake from the first replay they showed. And then later they showed a diff angle and it showed the truth.
From that quick replay they showed Perisic was offside.