England were left scratching their heads after their 2-1 win against Tunisia.
Harry Kane was at the double to ensure Gareth Southgate's side kept the pace with Belgium in Group G.
However, the victory was not without its controversy. The Tottenham striker ought to have been awarded two penalties as he was manhandled in the box.
Meanwhile, at the other end, Fakhreddine Ben Youssef earned his team a spot-kick on the back of some relatively minimal contact from Kyle Walker.
The forward was entitled to go down, nonetheless, and many fans felt the Manchester City man was out of sorts because Southgate had employed him as a centre-back as part of a back three.
Ferkani Sassi converted from 12 yards.
While England's main grievance was with the Kane incidents, there was confusion surrounding the Tunisia penalty too, with the video assistant referees ultimately upholding the decision of Colombian referee Wilmar Roldan to point to the spot.
And Walker has admitted that even the players themselves are not entirely sure how the VAR process works.
England players are baffled
“We’ve had a briefing, but what’s correct and what’s not? When do you ask for it? You don’t want to crowd the referee and say ‘VAR’ because then it is a yellow card," the defender told the London Evening Standard.
“I think you just have to let the referees get on with it and let them take the decisions. They have got a hard enough game as it is without putting any more confusion in it.
“It is one of those things that I am going to have to take on the chin. Would it have been given in the Premier League? Probably not. In the World Cup, it is probably a penalty.
“It is a learning curve for me. Next time I will probably head it away and ask questions afterwards!”
FIFA rules state that VAR is to be used regarding 'clear and obvious' errors. We've all heard that phrase 1000 times now, but what exactly is 'clear and obvious'?
Several incidents so far that have used the new system have still been heavily debated, so it's safe to say VAR has still not overcome its teething problems.
Antoine Griezmann made history by winning the first-ever World Cup penalty to be awarded by VAR during France's 2-1 win over Australia on Saturday.
It seemed as if it had shut down entirely in Volgograd and to England's detriment.
Fortunately, FIFA are planning a press conference soon to address the contentious decisions we've seen so far. You can bet Southgate will be listening in very carefully after last night.
What did you make of the use of VAR in England vs Tunisia? Have your say in the comments.
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