He didn't crash on that stage, that was not the reason he missed the split. He said he was blocked but didn't touch the ground.Not many people noticed, but Pogacar did crash in the Tour this year (stage 3, same as Roglic but less severe consequences obviously). People who follow him on social media also know he can crash in training as well (he did so earlier this year). So I know there's some banter out there (or even some pretty harsh criticism) about Roglic crashing a lot, but in cycling sooner or later everyone hits the deck.
Roglic just happens to have some famous crashes & losses.