Law 14 - The Penalty Kick - 1. Procedure explicitly states that:
The defending goalkeeper must remain on the goal line, facing the kicker, between the goalposts until the ball has been kicked.
However, from the image below, it's obvious that Schmeichel left the goal line before Modrić touched the ball.
Source: FIFA Youtube channel
Wasn't the referee supposed to caution Schmeichel and and call a retake according to Law 14 - The Penalty Kick - Offences and Sanctions?
If, before the ball is in play, [...] the goalkeeper or a team-mate offends:
- if the ball enters the goal, a goal is awarded
- if the ball does not enter the goal, the kick is retaken; the goalkeeper is cautioned if responsible for the offence
With the introduction of VAR, this offence had to be immediately noticed. Why referees are so merciful to the offending team when goalkeepers don't respect the penalty procedures? This type of offence occurs quite often in the game and I don't understand why referees tolerate it.