This one is controversial for two reasons.
Firstly, the decision itself.
France's Antoine Griezmann thought he had scored a late, late equalizer for France against Tunisia on Wednesday when he prodded home in the 98th minute, but after a check from the VAR, it was disallowed as the Atletico Madrid striker was adjudged to be offside.
When Aurelien Tchouameni first played the ball into the area, teammate Griezmann stood yards offside, but he made no attempt to play the ball.
Tunisia defender Montassar Talbi, however, tried to head the ball, but his clearance dropped right in front of Griezmann, who scored.
If the officials believed Talbi had made a "deliberate play" – the phase is reset, meaning Griezmann would be considered onside and his goal stands.
If the officials believed Talbi didn't make a deliberate play, the phase isn't reset, Griezmann would remain offside and the goal disallowed.
The definition of "deliberate play," though, is subjective. Essentially, the player has to be fully in control of what they are doing. They can't be stretching or reaching, and whether they are being challenged is also taken into consideration.
Now this is where it gets really complicated.
Whether or not the decision to disallow Griezmann's goal was right or wrong, France has complained to FIFA that the decision to even review the goal went against VAR protocol.
Before referee Matthew Conger went to the VAR, video evidence appears to show that he allowed Tunisia to restart with a free-kick before then blowing the final whistle.
Blowing the final whistle isn't an issue – a VAR check can still take place after full time. Allowing play to restart, however, is. By VAR protocol, it isn't possible to review the offside offense after play has resumed.
Sadly for France, even if Conger made a mistake here, it makes no difference now, as an incorrect review doesn't invalidate a match.