There's an article here covering the VAR incidents from the weekend, including the Havertz one. It has some input from the Premier League and match officials so isn't entirely independent.
https://www.espn.co.uk/football/stor...akanji-offside
Looks like the decision was overturned because VAR thought Havertz had moved his leg into Wan-Bissaka but that's so marginal to me (the still the article uses to 'prove' this does exactly the opposite). I don't get why Havertz would do that anyway as he had a free run in on goal, if he'd wanted a penalty then surely he would've just fallen over Wan-Bissaka's leg when he stuck it right in front of him a split second before?
I was thinking of the Simpson incident at QPR last season. Does nothing wrong at all, stays goal side of Armstrong as he chases an overhit pass that he had no chance of reaching. But when Armstrong falls over, Simpson gets a red card and concedes a penalty. Wan-Bissaka sticks a leg in front of Havertz as he's running through on goal, then brings him down with his knee but gets away with both. It's a funny old game.