Brazilian here. This map doesn't look like Rio, not at all. Y'all developers've been just lazy and didn't do your research :P NOTA ZERO

I connected the nav mesh more and made some spawn points more accessible to the special infected. I hope it solves the issue.

The map is nicely designed, unfortunately it is completely broken though. Half the playable area is treated as "out of bounds" and will result in spitter acid spawning on the players, especially on the rooftops. The infected pathing is pretty broken too, as tanks and other SI often get stuck, especially when holding out on the rooftops the tanks can't seem to find a way to climb up.
There's also a few areas that let you get completely out of bounds, simply by walking accross narrow ways or jumping from a high area.
It looks nice, but it's a pretty small and cramped map, with no easy holdout spot, I personally like that, it makes the map tougher and easier than vanilla maps where you sit in one place and keep shooting. Unfortunately due to the spitbug that occurs seemingly everywhere on the map it's unplayable.

Amazing level design!