Watched the replay of the incident this morning again, if anything I've gone from a probable penalty to a definite one. Zaha just leans into him with no intention or chance to get the ball.
The way they are using VAR right now is confusing to say the least as hilighted above by others it takes only a brushing of mane's arm to give one, bit a shovel on one of ours is handled differently.
The only difference is that input case the ref didn't initially give it, but the ref did for Mane. So, if the issue is not wanting to leave the referees embarrassed then that is a direct perversion of the laws and fairness of the game, and has lead yet again to overruling a clear and obvious error.
The other possibility is that the VAR official didn't think it was a penalty due to not sufficient contact. Which brings us back to the question of what is enough contact, and why is it seemingly a lower threshold for Mane, Salah for example? The next step up would have been zaha pushing Kevin over, so as Kev stays on his feet we are punished?