The reality is more nuanced, there are situations where you'd want to glance over it anyway, such as looking for an opportunity to coach a junior dev.

I'd rather hop in and get them on the right path rather than letting them struggle alone, particularly if they're struggling.

If it's another senior developer though I'd happily leave them to it to get the unit tests all passing before I take a proper look at their work.

But as a general principle, please at least get a PR through formatting checks before assigning it to a person.