You’d think a couple of years after release with regular world updates and patches that most bridges would now be modelled as bridges, and not photogrammetry draped over elevation data. At least significant landmark bridges such as the Golden Gate and Bay Bridge are now (very beautifully too) modelled accurately and yes you can fly under them without hitting a brick wall:
You don’t have to fly too far however before you start to see these again, here’s the Carquinez Bridge in Crockett, about 6 miles to the NE:
Don’t try flying under this one, it doesn’t end well.