Referees' chief Howard Webb has said the video assistant referee (VAR) was right not to interfere as Liverpool were not given a late penalty in their recent 1-1 draw with Manchester City.
But on-field referee Michael Oliver did not award the Reds a spot-kick, and VAR Stuart Attwell agreed.
"It's split a lot of opinion, hasn't it?" said Webb.
"It's one of those, for sure - if the referee gives it on the field, it would have been a 'check complete' by the VAR.
"Equally, having not given it, it's also 'check complete'.