And that isn't a problem, btw.
There were a lot of wrong marginal offside calls pre-VAR, it was one of the main drivers behind VAR, recognising that it was a very difficult thing to judge. Fans whinged, pundits pointed out the mistakes back then, but no-one in the ground noticed for 99% of the calls. The game went ahead smoothly. VAR should just correct the 1% that are obviously wrong. They should forget the lines, parallax, perspective and absolute truth, if you can't tell it's a mistake from normal video, just let it go.
In this case, it was a pretty clear mistake from the video and so was corrected. The mistake, as we know, was a poor communication protocol. Easy to fix.