Capybara+Rspec+Rails3.1 Assets not being requested after they were requested a first time

I'm using capybara+rspec to test my requests on a rails 3.1 application, I have two scenarios doing the exact same thing, no matter what the one thats executed first passes the second never passes unless I have config.cache_classes set to false, I realized that when it is set to true on the second scenario the assets are not being requested after they are requested the first time.

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What happens is that the first request of the assets happens normally when they are first needed, when theres a second request to a page that requires the assets already loaded there is no request to them, when rails is on development environment they are requested and if there are already cached rails returns a 304. This is not happening on test environment unless cached_classes is set to false, which breaks all my other tests and makes the test suite really slow.